qht: add qht-bench, a performance benchmark
This serves as a performance benchmark as well as a stress test for QHT. We can tweak quite a number of things, including the number of resize threads and how frequently resizes are triggered. A performance comparison of QHT vs CLHT[1] and ck_hs[2] using this same benchmark program can be found here: http://imgur.com/a/0Bms4 The tests are run on a 64-core AMD Opteron 6376, pinning threads to cores favoring same-socket cores. For each run, qht-bench is invoked with: $ tests/qht-bench -d $duration -n $n -u $u -g $range , where $duration is in seconds, $n is the number of threads, $u is the update rate (0.0 to 100.0), and $range is the number of keys. Note that ck_hs's performance drops significantly as writes go up, since it requires an external lock (I used a ck_spinlock) around every write. Also, note that CLHT instead of using a seqlock, relies on an allocator that does not ever return the same address during the same read-critical section. This gives it a slight performance advantage over QHT on read-heavy workloads, since the seqlock writes aren't there. [1] CLHT: https://github.com/LPD-EPFL/CLHT https://infoscience.epfl.ch/record/207109/files/ascy_asplos15.pdf [2] ck_hs: http://concurrencykit.org/ http://backtrace.io/blog/blog/2015/03/13/workload-specialization/ A few of those plots are shown in text here, since that site might not be online forever. Throughput is on Mops/s on the Y axis. 200K keys, 0 % updates 450 ++--+------+------+-------+-------+-------+-------+------+-------+--++ | + + + + + + + + +N+ | 400 ++ ---+E+ ++ | +++---- | 350 ++ 9 ++------+------++ --+E+ -+H+ ++ | | +H+- | -+N+---- ---- +++ | 300 ++ 8 ++ +E+ ++ -----+E+ --+H+ ++ | | +++ | -+N+-----+H+-- | 250 ++ 7 ++------+------++ +++-----+E+---- ++ 200 ++ 1 -+E+-----+H+ ++ | ---- qht +-E--+ | 150 ++ -+E+ clht +-H--+ ++ | ---- ck +-N--+ | 100 ++ +E+ ++ | ---- | 50 ++ -+E+ ++ | +E+E+ + + + + + + + + | 0 ++--E------+------+-------+-------+-------+-------+------+-------+--++ 1 8 16 24 32 40 48 56 64 Number of threads 200K keys, 1 % updates 350 ++--+------+------+-------+-------+-------+-------+------+-------+--++ | + + + + + + + + -+E+ | 300 ++ -----+H+ ++ | +E+-- | | 9 ++------+------++ +++---- | 250 ++ | +E+ -- | -+E+ ++ | 8 ++ -- ++ ---- | 200 ++ | +++- | +++ ---+E+ ++ | 7 ++------N------++ -+E+-- qht +-E--+ | | 1 +++---- clht +-H--+ | 150 ++ -+E+ ck +-N--+ ++ | ---- | 100 ++ +E+ ++ | ---- | | -+E+ | 50 ++ +H+-+N+----+N+-----+N+------ ++ | +E+E+ + + + +N+-----+N+-----+N+----+N+-----+N+ | 0 ++--E------+------+-------+-------+-------+-------+------+-------+--++ 1 8 16 24 32 40 48 56 64 Number of threads 200K keys, 20 % updates 300 ++--+------+------+-------+-------+-------+-------+------+-------+--++ | + + + + + + + + + | | -+H+ | 250 ++ ---- ++ | 9 ++------+------++ --+H+ ---+E+ | | 8 ++ +H+-- ++ -+H+----+E+-- | 200 ++ | +E+ --| -----+E+-- +++ ++ | 7 ++ + ---- ++ ---+H+---- +++ qht +-E--+ | 150 ++ 6 ++------N------++ -+H+-----+E+ clht +-H--+ ++ | 1 -----+E+-- ck +-N--+ | | -+H+---- | 100 ++ -----+E+ ++ | +E+-- | | ----+++ | 50 ++ -+E+ ++ | +E+ +++ | | +E+N+-+N+-----+ + + + + + + | 0 ++--E------+------N-------N-------N-------N-------N------N-------N--++ 1 8 16 24 32 40 48 56 64 Number of threads 200K keys, 100 % updates qht +-E--+ clht +-H--+ 160 ++--+------+------+-------+-------+-------+-------+---ck-+-N-----+--++ | + + + + + + + + ----H | 140 ++ +H+-- -+E+ ++ | +++---- ---- | 120 ++ 8 ++------+------++ -+H+ +E+ ++ | 7 ++ +H+---- ++ ---- +++---- | 100 ++ | +E+ | +++ ---+H+ -+E+ ++ | 6 ++ +++ ++ -+H+-- +++---- | 80 ++ 5 ++------N----------+E+-----+E+ ++ | 1 -+H+---- +++ | | -----+E+ | 60 ++ +H+---- +++ ++ | ----+E+ | 40 ++ +H+---- ++ | --+E+ | 20 ++ +E+ ++ | +EE+ + + + + + + + + | 0 ++--+N-N---N------N-------N-------N-------N-------N------N-------N--++ 1 8 16 24 32 40 48 56 64 Number of threads Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <1465412133-3029-13-git-send-email-cota@braap.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota
Richard Henderson
parent
1a95404fbd
commit
515864a0d7
1
tests/.gitignore
vendored
1
tests/.gitignore
vendored
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@ -7,6 +7,7 @@ check-qnull
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check-qstring
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check-qom-interface
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check-qom-proplist
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qht-bench
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rcutorture
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test-aio
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test-base64
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@ -400,7 +400,7 @@ test-obj-y = tests/check-qint.o tests/check-qstring.o tests/check-qdict.o \
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tests/test-opts-visitor.o tests/test-qmp-event.o \
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tests/rcutorture.o tests/test-rcu-list.o \
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tests/test-qdist.o \
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tests/test-qht.o
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tests/test-qht.o tests/qht-bench.o
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$(test-obj-y): QEMU_INCLUDES += -Itests
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QEMU_CFLAGS += -I$(SRC_PATH)/tests
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@ -441,6 +441,7 @@ tests/rcutorture$(EXESUF): tests/rcutorture.o $(test-util-obj-y)
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tests/test-rcu-list$(EXESUF): tests/test-rcu-list.o $(test-util-obj-y)
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tests/test-qdist$(EXESUF): tests/test-qdist.o $(test-util-obj-y)
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tests/test-qht$(EXESUF): tests/test-qht.o $(test-util-obj-y)
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tests/qht-bench$(EXESUF): tests/qht-bench.o $(test-util-obj-y)
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tests/test-qdev-global-props$(EXESUF): tests/test-qdev-global-props.o \
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hw/core/qdev.o hw/core/qdev-properties.o hw/core/hotplug.o\
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488
tests/qht-bench.c
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488
tests/qht-bench.c
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@ -0,0 +1,488 @@
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/*
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* Copyright (C) 2016, Emilio G. Cota <cota@braap.org>
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include <glib.h>
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#include "qemu/processor.h"
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#include "qemu/atomic.h"
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#include "qemu/qht.h"
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#include "qemu/rcu.h"
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#include "exec/tb-hash-xx.h"
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struct thread_stats {
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size_t rd;
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size_t not_rd;
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size_t in;
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size_t not_in;
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size_t rm;
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size_t not_rm;
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size_t rz;
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size_t not_rz;
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};
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struct thread_info {
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void (*func)(struct thread_info *);
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struct thread_stats stats;
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uint64_t r;
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bool write_op; /* writes alternate between insertions and removals */
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bool resize_down;
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} QEMU_ALIGNED(64); /* avoid false sharing among threads */
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static struct qht ht;
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static QemuThread *rw_threads;
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#define DEFAULT_RANGE (4096)
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#define DEFAULT_QHT_N_ELEMS DEFAULT_RANGE
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static unsigned int duration = 1;
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static unsigned int n_rw_threads = 1;
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static unsigned long lookup_range = DEFAULT_RANGE;
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static unsigned long update_range = DEFAULT_RANGE;
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static size_t init_range = DEFAULT_RANGE;
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static size_t init_size = DEFAULT_RANGE;
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static size_t n_ready_threads;
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static long populate_offset;
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static long *keys;
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static size_t resize_min;
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static size_t resize_max;
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static struct thread_info *rz_info;
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static unsigned long resize_delay = 1000;
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static double resize_rate; /* 0.0 to 1.0 */
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static unsigned int n_rz_threads = 1;
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static QemuThread *rz_threads;
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static double update_rate; /* 0.0 to 1.0 */
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static uint64_t update_threshold;
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static uint64_t resize_threshold;
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static size_t qht_n_elems = DEFAULT_QHT_N_ELEMS;
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static int qht_mode;
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static bool test_start;
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static bool test_stop;
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static struct thread_info *rw_info;
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static const char commands_string[] =
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" -d = duration, in seconds\n"
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" -n = number of threads\n"
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"\n"
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" -o = offset at which keys start\n"
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"\n"
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" -g = set -s,-k,-K,-l,-r to the same value\n"
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" -s = initial size hint\n"
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" -k = initial number of keys\n"
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" -K = initial range of keys (will be rounded up to pow2)\n"
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" -l = lookup range of keys (will be rounded up to pow2)\n"
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" -r = update range of keys (will be rounded up to pow2)\n"
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"\n"
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" -u = update rate (0.0 to 100.0), 50/50 split of insertions/removals\n"
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"\n"
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" -R = enable auto-resize\n"
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" -S = resize rate (0.0 to 100.0)\n"
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" -D = delay (in us) between potential resizes\n"
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" -N = number of resize threads";
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static void usage_complete(int argc, char *argv[])
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{
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fprintf(stderr, "Usage: %s [options]\n", argv[0]);
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fprintf(stderr, "options:\n%s\n", commands_string);
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exit(-1);
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}
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static bool is_equal(const void *obj, const void *userp)
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{
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const long *a = obj;
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const long *b = userp;
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return *a == *b;
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}
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static inline uint32_t h(unsigned long v)
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{
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return tb_hash_func5(v, 0, 0);
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}
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/*
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* From: https://en.wikipedia.org/wiki/Xorshift
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* This is faster than rand_r(), and gives us a wider range (RAND_MAX is only
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* guaranteed to be >= INT_MAX).
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*/
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static uint64_t xorshift64star(uint64_t x)
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{
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x ^= x >> 12; /* a */
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x ^= x << 25; /* b */
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x ^= x >> 27; /* c */
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return x * UINT64_C(2685821657736338717);
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}
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static void do_rz(struct thread_info *info)
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{
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struct thread_stats *stats = &info->stats;
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if (info->r < resize_threshold) {
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size_t size = info->resize_down ? resize_min : resize_max;
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bool resized;
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resized = qht_resize(&ht, size);
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info->resize_down = !info->resize_down;
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if (resized) {
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stats->rz++;
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} else {
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stats->not_rz++;
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}
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}
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g_usleep(resize_delay);
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}
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static void do_rw(struct thread_info *info)
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{
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struct thread_stats *stats = &info->stats;
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uint32_t hash;
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long *p;
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if (info->r >= update_threshold) {
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bool read;
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p = &keys[info->r & (lookup_range - 1)];
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hash = h(*p);
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read = qht_lookup(&ht, is_equal, p, hash);
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if (read) {
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stats->rd++;
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} else {
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stats->not_rd++;
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}
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} else {
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p = &keys[info->r & (update_range - 1)];
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hash = h(*p);
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if (info->write_op) {
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bool written = false;
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if (qht_lookup(&ht, is_equal, p, hash) == NULL) {
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written = qht_insert(&ht, p, hash);
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}
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if (written) {
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stats->in++;
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} else {
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stats->not_in++;
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}
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} else {
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bool removed = false;
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if (qht_lookup(&ht, is_equal, p, hash)) {
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removed = qht_remove(&ht, p, hash);
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}
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if (removed) {
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stats->rm++;
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} else {
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stats->not_rm++;
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}
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}
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info->write_op = !info->write_op;
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}
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}
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static void *thread_func(void *p)
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{
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struct thread_info *info = p;
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rcu_register_thread();
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atomic_inc(&n_ready_threads);
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while (!atomic_mb_read(&test_start)) {
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cpu_relax();
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}
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rcu_read_lock();
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while (!atomic_read(&test_stop)) {
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info->r = xorshift64star(info->r);
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info->func(info);
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}
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rcu_read_unlock();
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rcu_unregister_thread();
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return NULL;
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}
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/* sets everything except info->func */
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static void prepare_thread_info(struct thread_info *info, int i)
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{
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/* seed for the RNG; each thread should have a different one */
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info->r = (i + 1) ^ time(NULL);
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/* the first update will be a write */
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info->write_op = true;
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/* the first resize will be down */
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info->resize_down = true;
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memset(&info->stats, 0, sizeof(info->stats));
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}
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static void
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th_create_n(QemuThread **threads, struct thread_info **infos, const char *name,
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void (*func)(struct thread_info *), int offset, int n)
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{
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struct thread_info *info;
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QemuThread *th;
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int i;
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th = g_malloc(sizeof(*th) * n);
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*threads = th;
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info = qemu_memalign(64, sizeof(*info) * n);
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*infos = info;
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for (i = 0; i < n; i++) {
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prepare_thread_info(&info[i], offset + i);
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info[i].func = func;
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qemu_thread_create(&th[i], name, thread_func, &info[i],
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QEMU_THREAD_JOINABLE);
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}
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}
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static void create_threads(void)
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{
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th_create_n(&rw_threads, &rw_info, "rw", do_rw, 0, n_rw_threads);
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th_create_n(&rz_threads, &rz_info, "rz", do_rz, n_rw_threads, n_rz_threads);
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}
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static void pr_params(void)
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{
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printf("Parameters:\n");
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printf(" duration: %d s\n", duration);
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printf(" # of threads: %u\n", n_rw_threads);
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printf(" initial # of keys: %zu\n", init_size);
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printf(" initial size hint: %zu\n", qht_n_elems);
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printf(" auto-resize: %s\n",
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qht_mode & QHT_MODE_AUTO_RESIZE ? "on" : "off");
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if (resize_rate) {
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printf(" resize_rate: %f%%\n", resize_rate * 100.0);
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printf(" resize range: %zu-%zu\n", resize_min, resize_max);
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printf(" # resize threads %u\n", n_rz_threads);
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}
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printf(" update rate: %f%%\n", update_rate * 100.0);
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printf(" offset: %ld\n", populate_offset);
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printf(" initial key range: %zu\n", init_range);
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printf(" lookup range: %lu\n", lookup_range);
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printf(" update range: %lu\n", update_range);
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}
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static void do_threshold(double rate, uint64_t *threshold)
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{
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if (rate == 1.0) {
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*threshold = UINT64_MAX;
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} else {
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*threshold = rate * UINT64_MAX;
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}
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}
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static void htable_init(void)
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{
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unsigned long n = MAX(init_range, update_range);
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uint64_t r = time(NULL);
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size_t retries = 0;
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size_t i;
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/* avoid allocating memory later by allocating all the keys now */
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keys = g_malloc(sizeof(*keys) * n);
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for (i = 0; i < n; i++) {
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keys[i] = populate_offset + i;
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}
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/* some sanity checks */
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g_assert_cmpuint(lookup_range, <=, n);
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/* compute thresholds */
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do_threshold(update_rate, &update_threshold);
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do_threshold(resize_rate, &resize_threshold);
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if (resize_rate) {
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resize_min = n / 2;
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resize_max = n;
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assert(resize_min < resize_max);
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} else {
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n_rz_threads = 0;
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}
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/* initialize the hash table */
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qht_init(&ht, qht_n_elems, qht_mode);
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assert(init_size <= init_range);
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pr_params();
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fprintf(stderr, "Initialization: populating %zu items...", init_size);
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for (i = 0; i < init_size; i++) {
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for (;;) {
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uint32_t hash;
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long *p;
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r = xorshift64star(r);
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p = &keys[r & (init_range - 1)];
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hash = h(*p);
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if (qht_insert(&ht, p, hash)) {
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break;
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}
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retries++;
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}
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}
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fprintf(stderr, " populated after %zu retries\n", retries);
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}
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static void add_stats(struct thread_stats *s, struct thread_info *info, int n)
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{
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int i;
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for (i = 0; i < n; i++) {
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struct thread_stats *stats = &info[i].stats;
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s->rd += stats->rd;
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s->not_rd += stats->not_rd;
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s->in += stats->in;
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s->not_in += stats->not_in;
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s->rm += stats->rm;
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s->not_rm += stats->not_rm;
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s->rz += stats->rz;
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s->not_rz += stats->not_rz;
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}
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}
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static void pr_stats(void)
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{
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struct thread_stats s = {};
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double tx;
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add_stats(&s, rw_info, n_rw_threads);
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add_stats(&s, rz_info, n_rz_threads);
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printf("Results:\n");
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if (resize_rate) {
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printf(" Resizes: %zu (%.2f%% of %zu)\n",
|
||||
s.rz, (double)s.rz / (s.rz + s.not_rz) * 100, s.rz + s.not_rz);
|
||||
}
|
||||
|
||||
printf(" Read: %.2f M (%.2f%% of %.2fM)\n",
|
||||
(double)s.rd / 1e6,
|
||||
(double)s.rd / (s.rd + s.not_rd) * 100,
|
||||
(double)(s.rd + s.not_rd) / 1e6);
|
||||
printf(" Inserted: %.2f M (%.2f%% of %.2fM)\n",
|
||||
(double)s.in / 1e6,
|
||||
(double)s.in / (s.in + s.not_in) * 100,
|
||||
(double)(s.in + s.not_in) / 1e6);
|
||||
printf(" Removed: %.2f M (%.2f%% of %.2fM)\n",
|
||||
(double)s.rm / 1e6,
|
||||
(double)s.rm / (s.rm + s.not_rm) * 100,
|
||||
(double)(s.rm + s.not_rm) / 1e6);
|
||||
|
||||
tx = (s.rd + s.not_rd + s.in + s.not_in + s.rm + s.not_rm) / 1e6 / duration;
|
||||
printf(" Throughput: %.2f MT/s\n", tx);
|
||||
printf(" Throughput/thread: %.2f MT/s/thread\n", tx / n_rw_threads);
|
||||
}
|
||||
|
||||
static void run_test(void)
|
||||
{
|
||||
unsigned int remaining;
|
||||
int i;
|
||||
|
||||
while (atomic_read(&n_ready_threads) != n_rw_threads + n_rz_threads) {
|
||||
cpu_relax();
|
||||
}
|
||||
atomic_mb_set(&test_start, true);
|
||||
do {
|
||||
remaining = sleep(duration);
|
||||
} while (remaining);
|
||||
atomic_mb_set(&test_stop, true);
|
||||
|
||||
for (i = 0; i < n_rw_threads; i++) {
|
||||
qemu_thread_join(&rw_threads[i]);
|
||||
}
|
||||
for (i = 0; i < n_rz_threads; i++) {
|
||||
qemu_thread_join(&rz_threads[i]);
|
||||
}
|
||||
}
|
||||
|
||||
static void parse_args(int argc, char *argv[])
|
||||
{
|
||||
int c;
|
||||
|
||||
for (;;) {
|
||||
c = getopt(argc, argv, "d:D:g:k:K:l:hn:N:o:r:Rs:S:u:");
|
||||
if (c < 0) {
|
||||
break;
|
||||
}
|
||||
switch (c) {
|
||||
case 'd':
|
||||
duration = atoi(optarg);
|
||||
break;
|
||||
case 'D':
|
||||
resize_delay = atol(optarg);
|
||||
break;
|
||||
case 'g':
|
||||
init_range = pow2ceil(atol(optarg));
|
||||
lookup_range = pow2ceil(atol(optarg));
|
||||
update_range = pow2ceil(atol(optarg));
|
||||
qht_n_elems = atol(optarg);
|
||||
init_size = atol(optarg);
|
||||
break;
|
||||
case 'h':
|
||||
usage_complete(argc, argv);
|
||||
exit(0);
|
||||
case 'k':
|
||||
init_size = atol(optarg);
|
||||
break;
|
||||
case 'K':
|
||||
init_range = pow2ceil(atol(optarg));
|
||||
break;
|
||||
case 'l':
|
||||
lookup_range = pow2ceil(atol(optarg));
|
||||
break;
|
||||
case 'n':
|
||||
n_rw_threads = atoi(optarg);
|
||||
break;
|
||||
case 'N':
|
||||
n_rz_threads = atoi(optarg);
|
||||
break;
|
||||
case 'o':
|
||||
populate_offset = atol(optarg);
|
||||
break;
|
||||
case 'r':
|
||||
update_range = pow2ceil(atol(optarg));
|
||||
break;
|
||||
case 'R':
|
||||
qht_mode |= QHT_MODE_AUTO_RESIZE;
|
||||
break;
|
||||
case 's':
|
||||
qht_n_elems = atol(optarg);
|
||||
break;
|
||||
case 'S':
|
||||
resize_rate = atof(optarg) / 100.0;
|
||||
if (resize_rate > 1.0) {
|
||||
resize_rate = 1.0;
|
||||
}
|
||||
break;
|
||||
case 'u':
|
||||
update_rate = atof(optarg) / 100.0;
|
||||
if (update_rate > 1.0) {
|
||||
update_rate = 1.0;
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
parse_args(argc, argv);
|
||||
htable_init();
|
||||
create_threads();
|
||||
run_test();
|
||||
pr_stats();
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in a new issue