Hi, Scott Lamb I've make a benchmark for single-threaded vs. multi-threaded libevent approaches. The single-threaded program is memcached 1.2.0. The multi-threaded program is spcached.
spcached is a server which implements memcached protocol. More detail about spcached, please refer its home page: http://code.google.com/p/spcached/ Using memcached java client as benchmark tool: http://code.google.com/p/spcached/wiki/benchmarktool memcached 1.2.0 is a single-threaded event-driven program. spcached uses a half-sync/half-async thread pool, it has a main thread to process I/O event, and a worker thread to process the real request. The test enviroment is : Hardware: DELL 640M ( CPU Intel T2300, RAM 1G ) Software: windows xp vmware 5.5.1 ( allocate 128M RAM ) RedHat 7.2(Kernel 2.4.18-3) The test steps are: 1.restart windows xp and vmware 2.limit memcached and spcached both can only keep 185808 objects 3.start memcached and MemCachedThreadBench ( the memcached and benchmark tool run on the same vmware ) bash$ memcached -m 96 4.stop memcached, start spcached and MemCachedThreadBench bash$ spcached -c 185808 The test result is: For set operation: memcached : spcached -- 4000 : 2600 ( > 4 threads ) For get operation: memcached : spcached -- 3500 : 2480 ( > 4 threads ) Detail test result: memcached PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND 22642 xxxxx 15 0 100M 60M 5488 S 0.0 49.2 19:27 memcached bash$ java com/danga/MemCached/test/MemCachedThreadBench 500000 0 11211 1 Thread start runs set time(ms) get time(ms) Main 500000 168924 149234 ReqPerSecond set - 2959 get - 3350 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 250000 0 11211 2 Thread start runs set time(ms) get time(ms) Main 500000 135051 153600 ReqPerSecond set - 3702 get - 3255 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 166666 0 11211 3 Thread start runs set time(ms) get time(ms) Main 499998 141120 156591 ReqPerSecond set - 3543 get - 3193 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 125000 0 11211 4 Thread start runs set time(ms) get time(ms) Main 500000 123370 142169 ReqPerSecond set - 4052 get - 3516 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 100000 0 11211 5 Thread start runs set time(ms) get time(ms) Main 500000 124111 142147 ReqPerSecond set - 4028 get - 3517 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 83333 0 11211 6 Thread start runs set time(ms) get time(ms) Main 499998 123504 141857 ReqPerSecond set - 4048 get - 3524 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 71428 0 11211 7 Thread start runs set time(ms) get time(ms) Main 499996 124767 142939 ReqPerSecond set - 4007 get - 3497 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 62500 0 11211 8 Thread start runs set time(ms) get time(ms) Main 500000 124746 142887 ReqPerSecond set - 4008 get - 3499 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 55555 0 11211 9 Thread start runs set time(ms) get time(ms) Main 499995 124821 143278 ReqPerSecond set - 4005 get - 3489 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 50000 0 11211 10 Thread start runs set time(ms) get time(ms) Main 500000 124865 143082 ReqPerSecond set - 4004 get - 3494 ============================================================================= spcached PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND 24536 xxx 15 0 74948 73M 608 S 0.0 59.2 25:31 spcached bash$ java com/danga/MemCached/test/MemCachedThreadBench 500000 0 11216 1 Thread start runs set time(ms) get time(ms) Main 500000 195136 209098 ReqPerSecond set - 2562 get - 2391 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 250000 0 11216 2 Thread start runs set time(ms) get time(ms) Main 500000 199820 213581 ReqPerSecond set - 2502 get - 2341 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 166666 0 11216 3 Thread start runs set time(ms) get time(ms) Main 499998 190134 203171 ReqPerSecond set - 2629 get - 2460 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 125000 0 11216 4 Thread start runs set time(ms) get time(ms) Main 500000 189092 202166 ReqPerSecond set - 2644 get - 2473 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 100000 0 11216 5 Thread start runs set time(ms) get time(ms) Main 500000 189452 200893 ReqPerSecond set - 2639 get - 2488 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 83333 0 11216 6 Thread start runs set time(ms) get time(ms) Main 499998 188704 201101 ReqPerSecond set - 2649 get - 2486 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 71428 0 11216 7 Thread start runs set time(ms) get time(ms) Main 499996 189220 201354 ReqPerSecond set - 2642 get - 2483 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 62500 0 11216 8 Thread start runs set time(ms) get time(ms) Main 500000 190293 201664 ReqPerSecond set - 2627 get - 2479 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 55555 0 11216 9 Thread start runs set time(ms) get time(ms) Main 499995 191152 202004 ReqPerSecond set - 2615 get - 2475 -- bash$ java com/danga/MemCached/test/MemCachedThreadBench 50000 0 11216 10 Thread start runs set time(ms) get time(ms) Main 500000 191352 202574 ReqPerSecond set - 2612 get - 2468 Best regards， liusifan 2007-05-18 >>>On May 11, 2007, at 8:46 AM, Niels Provos wrote: >> I would really like to see measurements on that. Do you have any >> graphs that show the performance differences between single-threaded >> and multi-threaded implementation? > >Speaking of which, I've been meaning to benchmark some single- >threaded vs. multi-threaded libevent approaches for a while, but >haven't really gotten around to working up appropriate benchmark >software. > >But it occurs to me...you have those nice graphs on the libevent >webpage of different implementations. What'd you use to make that? >Maybe it could be adapted pretty easily. > >-- >Scott Lamb <http://www.slamb.org/> > > >_______________________________________________ >Libevent-users mailing list >Libevent-users@monkey.org >http://monkey.org/mailman/listinfo/libevent-users > >
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