From: Mike Galbraith <efault@gmx.de>
To: LKML <linux-kernel@vger.kernel.org>
Subject: latencytop kills volanomark throughput. yawn?
Date: Fri, 11 Apr 2008 08:47:56 +0200 [thread overview]
Message-ID: <1207896476.16745.18.camel@marge.simson.net> (raw)
[-- Attachment #1: Type: text/plain, Size: 327 bytes --]
Greetings list,
The moral of this story is probably "don't do that", but...
While doing some scheduler testing recently, I ran volanomark, and
accidentally left latencytop running. The results were decidedly
un-good, and the reason appears to be that MUCH time is spent crawling
over a list of (106 loaded) modules.
-Mike
[-- Attachment #2: oreport-2.6.25-smp-latencytop --]
[-- Type: text/plain, Size: 4319 bytes --]
2.6.25-smp
ulimit -Sn = 1024
/usr/bin/java -server -Xmx64m -Dinstall.root=. -Dcatalina.home=. -cp .:lib/bootstrap.jar:lib/catalina.jar:lib/naming-common.jar:lib/naming-resources.jar:lib/servlet.jar:lib/servlets-common.jar:lib/servlets-default.jar:lib/volanochat-server.jar:lib/xerces.jar COM.volano.Main
VolanoChat(TM) Server Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Loading server properties from "/root/vmark2.5.0.9/conf/properties.txt".
marge:8000 (127.0.0.2:8000) VolanoChatPro - unlimited connections.
ulimit -Sn = 1024
/usr/bin/java -server -Xmx64m -Dinstall.root=. -Dcatalina.home=. -cp .:lib/bootstrap.jar:lib/catalina.jar:lib/naming-common.jar:lib/naming-resources.jar:lib/servlet.jar:lib/servlets-common.jar:lib/servlets-default.jar:lib/volanochat-server.jar:lib/xerces.jar COM.volano.Mark -run -count 2500
VolanoMark(TM) Benchmark Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Creating room number 1 ...
20 connections so far.
Creating room number 2 ...
40 connections so far.
Creating room number 3 ...
60 connections so far.
Creating room number 4 ...
80 connections so far.
Creating room number 5 ...
100 connections so far.
Creating room number 6 ...
120 connections so far.
Creating room number 7 ...
140 connections so far.
Creating room number 8 ...
160 connections so far.
Creating room number 9 ...
180 connections so far.
Creating room number 10 ...
200 connections so far.
Java heap: 4225 KB in use, 11968 KB available (35% in use).
Running the test ...
Test complete.
VolanoMark version = 2.5.0.9
Messages sent = 500000
Messages received = 9500000
Total messages = 10000000
Elapsed time = 256.251 seconds
Average throughput = 39024 messages per second
VolanoMark(TM) Benchmark Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Creating room number 1 ...
20 connections so far.
Creating room number 2 ...
40 connections so far.
Creating room number 3 ...
60 connections so far.
Creating room number 4 ...
80 connections so far.
Creating room number 5 ...
100 connections so far.
Creating room number 6 ...
120 connections so far.
Creating room number 7 ...
140 connections so far.
Creating room number 8 ...
160 connections so far.
Creating room number 9 ...
180 connections so far.
Creating room number 10 ...
200 connections so far.
Java heap: 4055 KB in use, 11968 KB available (34% in use).
Running the test ...
Test complete.
VolanoMark version = 2.5.0.9
Messages sent = 500000
Messages received = 9500000
Total messages = 10000000
Elapsed time = 260.755 seconds
Average throughput = 38350 messages per second
VolanoMark(TM) Benchmark Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Creating room number 1 ...
20 connections so far.
Creating room number 2 ...
40 connections so far.
Creating room number 3 ...
60 connections so far.
Creating room number 4 ...
80 connections so far.
Creating room number 5 ...
100 connections so far.
Creating room number 6 ...
120 connections so far.
Creating room number 7 ...
140 connections so far.
Creating room number 8 ...
160 connections so far.
Creating room number 9 ...
180 connections so far.
Creating room number 10 ...
200 connections so far.
Java heap: 4079 KB in use, 11968 KB available (34% in use).
Running the test ...
Test complete.
VolanoMark version = 2.5.0.9
Messages sent = 500000
Messages received = 9500000
Total messages = 10000000
Elapsed time = 257.859 seconds
Average throughput = 38781 messages per second
CPU: Core 2, speed 2400 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
Samples on CPU 0
Samples on CPU 1
Samples on CPU 2
Samples on CPU 3
vma samples % samples % samples % samples % symbol name
ffffffff80250ac3 7275309 75.2127 7484800 75.2938 7470398 75.2679 7496386 75.3165 __module_text_address
ffffffff80242f08 153617 1.5881 159017 1.5996 157306 1.5849 158765 1.5951 core_kernel_text
ffffffff80242f77 137870 1.4253 146199 1.4707 145779 1.4688 146526 1.4722 __kernel_text_address
ffffffff8040fa80 131667 1.3612 134133 1.3493 133196 1.3420 133695 1.3432 schedule
[-- Attachment #3: oreport-2.6.25-smp-no-latencytop --]
[-- Type: text/plain, Size: 6626 bytes --]
2.6.25-smp
ulimit -Sn = 1024
/usr/bin/java -server -Xmx64m -Dinstall.root=. -Dcatalina.home=. -cp .:lib/bootstrap.jar:lib/catalina.jar:lib/naming-common.jar:lib/naming-resources.jar:lib/servlet.jar:lib/servlets-common.jar:lib/servlets-default.jar:lib/volanochat-server.jar:lib/xerces.jar COM.volano.Main
VolanoChat(TM) Server Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Loading server properties from "/root/vmark2.5.0.9/conf/properties.txt".
marge:8000 (127.0.0.2:8000) VolanoChatPro - unlimited connections.
Apache Tomcat/4.0.3
ulimit -Sn = 1024
/usr/bin/java -server -Xmx64m -Dinstall.root=. -Dcatalina.home=. -cp .:lib/bootstrap.jar:lib/catalina.jar:lib/naming-common.jar:lib/naming-resources.jar:lib/servlet.jar:lib/servlets-common.jar:lib/servlets-default.jar:lib/volanochat-server.jar:lib/xerces.jar COM.volano.Mark -run -count 2500
VolanoMark(TM) Benchmark Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Creating room number 1 ...
20 connections so far.
Creating room number 2 ...
40 connections so far.
Creating room number 3 ...
60 connections so far.
Creating room number 4 ...
80 connections so far.
Creating room number 5 ...
100 connections so far.
Creating room number 6 ...
120 connections so far.
Creating room number 7 ...
140 connections so far.
Creating room number 8 ...
160 connections so far.
Creating room number 9 ...
180 connections so far.
Creating room number 10 ...
200 connections so far.
Java heap: 4103 KB in use, 11968 KB available (34% in use).
Running the test ...
Test complete.
VolanoMark version = 2.5.0.9
Messages sent = 500000
Messages received = 9500000
Total messages = 10000000
Elapsed time = 80.53 seconds
Average throughput = 124177 messages per second
VolanoMark(TM) Benchmark Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Creating room number 1 ...
20 connections so far.
Creating room number 2 ...
40 connections so far.
Creating room number 3 ...
60 connections so far.
Creating room number 4 ...
80 connections so far.
Creating room number 5 ...
100 connections so far.
Creating room number 6 ...
120 connections so far.
Creating room number 7 ...
140 connections so far.
Creating room number 8 ...
160 connections so far.
Creating room number 9 ...
180 connections so far.
Creating room number 10 ...
200 connections so far.
Java heap: 4066 KB in use, 11968 KB available (34% in use).
Running the test ...
Test complete.
VolanoMark version = 2.5.0.9
Messages sent = 500000
Messages received = 9500000
Total messages = 10000000
Elapsed time = 82.893 seconds
Average throughput = 120637 messages per second
VolanoMark(TM) Benchmark Version 2.5.0.9
Copyright (C) 1996-2002 Volano LLC. All rights reserved.
Creating room number 1 ...
20 connections so far.
Creating room number 2 ...
40 connections so far.
Creating room number 3 ...
60 connections so far.
Creating room number 4 ...
80 connections so far.
Creating room number 5 ...
100 connections so far.
Creating room number 6 ...
120 connections so far.
Creating room number 7 ...
140 connections so far.
Creating room number 8 ...
160 connections so far.
Creating room number 9 ...
180 connections so far.
Creating room number 10 ...
200 connections so far.
Java heap: 4066 KB in use, 11968 KB available (34% in use).
Running the test ...
Test complete.
VolanoMark version = 2.5.0.9
Messages sent = 500000
Messages received = 9500000
Total messages = 10000000
Elapsed time = 83.045 seconds
Average throughput = 120417 messages per second
CPU: Core 2, speed 2400 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
Samples on CPU 0
Samples on CPU 1
Samples on CPU 2
Samples on CPU 3
vma samples % samples % samples % samples % symbol name
ffffffff8040fa80 101885 7.3225 105675 7.3536 104738 7.3105 104360 7.2758 schedule
ffffffff8020a872 38079 2.7367 38675 2.6913 38259 2.6704 37778 2.6338 __switch_to
ffffffff803cd4a1 37283 2.6795 37872 2.6354 38264 2.6708 38416 2.6783 tcp_sendmsg
ffffffff803bce72 34238 2.4607 35386 2.4624 35458 2.4749 35369 2.4659 nf_iterate
ffffffff803d6dff 33708 2.4226 34382 2.3925 35210 2.4576 34770 2.4241 tcp_transmit_skb
ffffffff8022b435 32216 2.3154 32801 2.2825 32441 2.2643 32561 2.2701 task_rq_lock
ffffffff8041019b 30984 2.2268 32897 2.2892 33092 2.3098 33149 2.3111 thread_return
ffffffff80212710 28698 2.0625 29613 2.0607 29925 2.0887 30017 2.0927 native_read_tsc
ffffffff803a2c34 27350 1.9656 28071 1.9534 27624 1.9281 27601 1.9243 netif_rx
ffffffff803dcd35 27329 1.9641 27798 1.9344 28084 1.9602 28233 1.9683 tcp_v4_rcv
ffffffff802ffbe0 26391 1.8967 30879 2.1488 29893 2.0865 31739 2.2128 copy_user_generic_string
ffffffff803c6bb7 24902 1.7897 25270 1.7585 24637 1.7196 25099 1.7499 ip_queue_xmit
ffffffff8039dc47 24866 1.7871 26068 1.8140 25733 1.7961 25869 1.8035 skb_release_all
ffffffff8028db6b 24765 1.7799 25006 1.7401 25154 1.7557 25707 1.7922 fget_light
ffffffff80228378 23550 1.6925 24488 1.7040 23946 1.6714 24154 1.6840 __enqueue_entity
ffffffff803c9bd6 23270 1.6724 23490 1.6346 23264 1.6238 23375 1.6297 __inet_lookup_established
ffffffff8022f3a1 19656 1.4127 19080 1.3277 19152 1.3368 19208 1.3391 select_task_rq_fair
ffffffff803ce391 19498 1.4013 20477 1.4249 20394 1.4235 20409 1.4229 tcp_recvmsg
ffffffff803d1680 18634 1.3392 19414 1.3510 19538 1.3637 19178 1.3371 tcp_ack
ffffffff8023793d 18106 1.3013 18399 1.2803 18285 1.2763 18610 1.2975 local_bh_enable
ffffffff8020be00 17235 1.2387 17809 1.2393 17673 1.2335 17890 1.2473 system_call
ffffffff803a53f1 16076 1.1554 16560 1.1524 16230 1.1328 16464 1.1478 process_backlog
ffffffff803d5c26 15110 1.0860 16067 1.1180 15661 1.0931 15441 1.0765 tcp_rcv_established
ffffffff803d8892 15045 1.0813 15420 1.0730 15406 1.0753 15560 1.0848 __tcp_push_pending_frames
ffffffff80228683 14623 1.0510 14960 1.0410 14816 1.0341 14830 1.0339 hrtick_start_fair
ffffffff80212510 14567 1.0469 14818 1.0311 14922 1.0415 14979 1.0443 native_sched_clock
reply other threads:[~2008-04-11 6:48 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1207896476.16745.18.camel@marge.simson.net \
--to=efault@gmx.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®