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Unstable ThreadPool performance under massive QueueUserWorkItem requests.
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Unstable ThreadPool performance under massive QueueUserWorkItem requests.
by Laser Lu
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I'm writing a program that utilizes ThreadPool heavily. More than thousands
of QueueUserWorkItem request may be generated during a second. And this program works fine on Windows/.NET. When I come to test on Linux/Mono, it becomes unstable. Large CPU consumption often occurs. The same program usually takes 1-5% CPU on Windows and similar hardware. However, on CentOS(2 core), the CPU usage may suddenly jump to a very high (nearly 200%) level and then fall back to normal, and then jump high again.. It seems very unstable. Below is the output of command 'top |grep mono' (run on CentOS, 2 core CPU): 12926 root 15 0 43644 11m 4980 S 16.0 0.3 0:00.48 mono 12926 root 15 0 48068 15m 5052 S 18.6 0.5 0:01.04 mono 12926 root 15 0 80640 20m 5060 S 168.0 0.6 0:06.09 mono 12926 root 15 0 87372 22m 5064 S 189.3 0.7 0:11.78 mono 12926 root 15 0 85816 24m 5064 S 52.9 0.7 0:13.37 mono 12926 root 19 0 86408 24m 5064 S 13.3 0.7 0:13.77 mono 12926 root 19 0 86408 24m 5064 S 195.6 0.7 0:19.65 mono 12926 root 15 0 86408 24m 5064 S 195.9 0.7 0:25.54 mono 12926 root 18 0 91740 26m 5064 S 199.6 0.8 0:31.98 mono 12926 root 18 0 91740 26m 5064 S 191.2 0.8 0:37.96 mono 12926 root 15 0 91740 26m 5064 S 193.6 0.8 0:43.78 mono 12926 root 15 0 91740 26m 5064 S 199.3 0.8 0:49.77 mono 12926 root 15 0 91740 26m 5064 S 198.9 0.8 0:55.75 mono 12926 root 15 0 91740 26m 5064 S 199.9 0.8 1:01.76 mono 12926 root 15 0 91740 26m 5064 S 199.5 0.8 1:07.76 mono 12926 root 15 0 91740 26m 5064 S 199.9 0.8 1:13.77 mono 12926 root 15 0 91740 26m 5064 S 198.9 0.8 1:19.75 mono 12926 root 15 0 91740 26m 5064 S 199.3 0.8 1:25.74 mono 12926 root 15 0 91740 26m 5064 S 199.6 0.8 1:31.74 mono 12926 root 15 0 91740 26m 5064 S 199.9 0.8 1:37.75 mono 12926 root 23 0 91788 28m 5064 S 87.5 0.8 1:40.38 mono 12926 root 23 0 91196 28m 5064 S 0.3 0.8 1:40.39 mono 12926 root 15 0 91788 28m 5064 S 20.3 0.8 1:41.00 mono 12926 root 15 0 91196 28m 5064 S 4.3 0.8 1:41.13 mono 12926 root 15 0 91772 28m 5064 S 11.3 0.8 1:41.47 mono 12926 root 15 0 91772 27m 5064 S 22.0 0.8 1:42.13 mono 12926 root 15 0 91772 26m 5064 S 28.9 0.8 1:43.00 mono 12926 root 24 0 91196 26m 5064 S 1.3 0.8 1:43.04 mono 12926 root 15 0 91804 26m 5064 S 34.3 0.8 1:44.07 mono 12926 root 15 0 91196 26m 5064 S 4.3 0.8 1:44.20 mono 12926 root 17 0 91772 25m 5064 S 13.6 0.7 1:44.61 mono 12926 root 15 0 91196 25m 5064 S 16.0 0.7 1:45.09 mono 12926 root 15 0 91292 25m 5064 S 1.3 0.7 1:45.13 mono 12926 root 15 0 91804 24m 5064 S 134.6 0.7 1:49.40 mono 12926 root 15 0 91196 24m 5064 S 13.4 0.7 1:49.81 mono 12926 root 15 0 91196 24m 5064 S 0.7 0.7 1:49.83 mono 12926 root 15 0 91772 24m 5064 S 21.6 0.7 1:50.48 mono 12926 root 15 0 91804 23m 5064 S 3.3 0.7 1:50.58 mono 12926 root 15 0 91804 23m 5064 S 22.3 0.7 1:51.25 mono 12926 root 15 0 91804 23m 5064 S 3.3 0.7 1:51.35 mono 12926 root 24 0 91804 23m 5064 S 14.0 0.7 1:51.77 mono 12926 root 15 0 91196 23m 5064 S 14.6 0.7 1:52.21 mono 12926 root 15 0 91196 23m 5064 S 2.7 0.7 1:52.29 mono 12926 root 15 0 91804 23m 5064 S 178.9 0.7 1:57.67 mono 12926 root 15 0 91804 23m 5064 S 184.2 0.7 2:03.38 mono 12926 root 15 0 91804 23m 5064 S 196.5 0.7 2:09.29 mono 12926 root 15 0 91804 23m 5064 S 198.2 0.7 2:15.25 mono 12926 root 15 0 91804 23m 5064 S 198.1 0.7 2:21.21 mono 12926 root 15 0 91804 23m 5064 S 123.7 0.7 2:24.93 mono 12926 root 15 0 91196 24m 5064 S 1.7 0.7 2:24.98 mono 12926 root 15 0 91804 24m 5064 S 70.5 0.7 2:27.10 mono 12926 root 15 0 91804 24m 5064 S 198.7 0.7 2:33.27 mono 12926 root 15 0 91196 24m 5064 S 23.0 0.7 2:33.98 mono 12926 root 20 0 91212 24m 5064 S 1.0 0.7 2:34.01 mono 12926 root 15 0 91788 24m 5064 S 25.6 0.7 2:34.78 mono 12926 root 15 0 91196 24m 5064 S 1.0 0.7 2:34.81 mono 12926 root 17 0 91772 24m 5064 S 15.0 0.7 2:35.26 mono 12926 root 15 0 91196 24m 5064 S 12.0 0.7 2:35.62 mono 12926 root 15 0 91500 23m 5064 S 3.7 0.7 2:35.73 mono 12926 root 15 0 91644 23m 5064 S 183.1 0.7 2:41.24 mono 12926 root 15 0 91628 23m 5064 S 191.9 0.7 2:47.01 mono 12926 root 15 0 91628 23m 5064 S 197.2 0.7 2:52.94 mono 12926 root 15 0 91612 23m 5064 S 198.9 0.7 2:58.92 mono 12926 root 15 0 91596 23m 5064 S 199.2 0.7 3:04.91 mono 12926 root 15 0 91596 23m 5064 S 199.5 0.7 3:10.91 mono 12926 root 15 0 91596 23m 5064 S 199.5 0.7 3:16.91 mono 12926 root 15 0 91708 23m 5064 S 155.0 0.7 3:21.57 mono 12926 root 15 0 91260 24m 5064 S 92.4 0.7 3:24.35 mono 12926 root 15 0 91260 24m 5064 S 193.2 0.7 3:30.16 mono 12926 root 15 0 91740 24m 5064 S 104.4 0.7 3:33.30 mono 12926 root 17 0 91740 24m 5064 S 10.6 0.7 3:33.62 mono 12926 root 15 0 91196 24m 5064 S 11.0 0.7 3:33.95 mono 12926 root 15 0 91804 24m 5064 S 153.0 0.7 3:38.55 mono 12926 root 15 0 91804 24m 5064 S 195.5 0.7 3:44.43 mono 12926 root 15 0 91804 24m 5064 S 197.9 0.7 3:50.38 mono 12926 root 15 0 91804 24m 5064 S 197.2 0.7 3:56.31 mono 12926 root 15 0 91804 24m 5064 S 197.9 0.7 4:02.26 mono 12926 root 15 0 91804 24m 5064 S 197.5 0.7 4:08.20 mono 12926 root 15 0 91804 24m 5064 S 196.2 0.7 4:14.10 mono 12926 root 15 0 91804 24m 5064 S 199.9 0.7 4:20.11 mono 12926 root 15 0 91804 24m 5064 S 198.2 0.7 4:26.07 mono 12926 root 19 0 91196 23m 5068 S 21.9 0.7 4:26.73 mono _______________________________________________ Mono-devel-list mailing list Mono-devel-list@... http://lists.ximian.com/mailman/listinfo/mono-devel-list |
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Re: Unstable ThreadPool performance under massive QueueUserWorkItem requests.
by Leszek Ciesielski
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What Mono version are you using? If you observe this behaviour with a
recent version (2.4.2.3 is current), could you please post your test case? On Sat, Nov 7, 2009 at 11:55 AM, Laser Lu <laser_lu@...> wrote: > I'm writing a program that utilizes ThreadPool heavily. More than thousands > of QueueUserWorkItem request may be generated during a second. And this > program works fine on Windows/.NET. > When I come to test on Linux/Mono, it becomes unstable. Large CPU > consumption often occurs. The same program usually takes 1-5% CPU on Windows > and similar hardware. However, on CentOS(2 core), the CPU usage may suddenly > jump to a very high (nearly 200%) level and then fall back to normal, and > then jump high again.. It seems very unstable. > > Below is the output of command 'top |grep mono' (run on CentOS, 2 core CPU): > 12926 root 15 0 43644 11m 4980 S 16.0 0.3 0:00.48 mono > > 12926 root 15 0 48068 15m 5052 S 18.6 0.5 0:01.04 mono > > 12926 root 15 0 80640 20m 5060 S 168.0 0.6 0:06.09 mono > > 12926 root 15 0 87372 22m 5064 S 189.3 0.7 0:11.78 mono > > 12926 root 15 0 85816 24m 5064 S 52.9 0.7 0:13.37 mono > > 12926 root 19 0 86408 24m 5064 S 13.3 0.7 0:13.77 mono > > 12926 root 19 0 86408 24m 5064 S 195.6 0.7 0:19.65 mono > > 12926 root 15 0 86408 24m 5064 S 195.9 0.7 0:25.54 mono > > 12926 root 18 0 91740 26m 5064 S 199.6 0.8 0:31.98 mono > > 12926 root 18 0 91740 26m 5064 S 191.2 0.8 0:37.96 mono > > 12926 root 15 0 91740 26m 5064 S 193.6 0.8 0:43.78 mono > > 12926 root 15 0 91740 26m 5064 S 199.3 0.8 0:49.77 mono > > 12926 root 15 0 91740 26m 5064 S 198.9 0.8 0:55.75 mono > > 12926 root 15 0 91740 26m 5064 S 199.9 0.8 1:01.76 mono > > 12926 root 15 0 91740 26m 5064 S 199.5 0.8 1:07.76 mono > > 12926 root 15 0 91740 26m 5064 S 199.9 0.8 1:13.77 mono > > 12926 root 15 0 91740 26m 5064 S 198.9 0.8 1:19.75 mono > > 12926 root 15 0 91740 26m 5064 S 199.3 0.8 1:25.74 mono > > 12926 root 15 0 91740 26m 5064 S 199.6 0.8 1:31.74 mono > > 12926 root 15 0 91740 26m 5064 S 199.9 0.8 1:37.75 mono > > 12926 root 23 0 91788 28m 5064 S 87.5 0.8 1:40.38 mono > > 12926 root 23 0 91196 28m 5064 S 0.3 0.8 1:40.39 mono > > 12926 root 15 0 91788 28m 5064 S 20.3 0.8 1:41.00 mono > > 12926 root 15 0 91196 28m 5064 S 4.3 0.8 1:41.13 mono > > 12926 root 15 0 91772 28m 5064 S 11.3 0.8 1:41.47 mono > > 12926 root 15 0 91772 27m 5064 S 22.0 0.8 1:42.13 mono > > 12926 root 15 0 91772 26m 5064 S 28.9 0.8 1:43.00 mono > > 12926 root 24 0 91196 26m 5064 S 1.3 0.8 1:43.04 mono > > 12926 root 15 0 91804 26m 5064 S 34.3 0.8 1:44.07 mono > > 12926 root 15 0 91196 26m 5064 S 4.3 0.8 1:44.20 mono > > 12926 root 17 0 91772 25m 5064 S 13.6 0.7 1:44.61 mono > > 12926 root 15 0 91196 25m 5064 S 16.0 0.7 1:45.09 mono > > 12926 root 15 0 91292 25m 5064 S 1.3 0.7 1:45.13 mono > > 12926 root 15 0 91804 24m 5064 S 134.6 0.7 1:49.40 mono > > 12926 root 15 0 91196 24m 5064 S 13.4 0.7 1:49.81 mono > > 12926 root 15 0 91196 24m 5064 S 0.7 0.7 1:49.83 mono > > 12926 root 15 0 91772 24m 5064 S 21.6 0.7 1:50.48 mono > > 12926 root 15 0 91804 23m 5064 S 3.3 0.7 1:50.58 mono > > 12926 root 15 0 91804 23m 5064 S 22.3 0.7 1:51.25 mono > > 12926 root 15 0 91804 23m 5064 S 3.3 0.7 1:51.35 mono > > 12926 root 24 0 91804 23m 5064 S 14.0 0.7 1:51.77 mono > > 12926 root 15 0 91196 23m 5064 S 14.6 0.7 1:52.21 mono > > 12926 root 15 0 91196 23m 5064 S 2.7 0.7 1:52.29 mono > > 12926 root 15 0 91804 23m 5064 S 178.9 0.7 1:57.67 mono > > 12926 root 15 0 91804 23m 5064 S 184.2 0.7 2:03.38 mono > > 12926 root 15 0 91804 23m 5064 S 196.5 0.7 2:09.29 mono > > 12926 root 15 0 91804 23m 5064 S 198.2 0.7 2:15.25 mono > > 12926 root 15 0 91804 23m 5064 S 198.1 0.7 2:21.21 mono > > 12926 root 15 0 91804 23m 5064 S 123.7 0.7 2:24.93 mono > > 12926 root 15 0 91196 24m 5064 S 1.7 0.7 2:24.98 mono > > 12926 root 15 0 91804 24m 5064 S 70.5 0.7 2:27.10 mono > > 12926 root 15 0 91804 24m 5064 S 198.7 0.7 2:33.27 mono > > 12926 root 15 0 91196 24m 5064 S 23.0 0.7 2:33.98 mono > > 12926 root 20 0 91212 24m 5064 S 1.0 0.7 2:34.01 mono > > 12926 root 15 0 91788 24m 5064 S 25.6 0.7 2:34.78 mono > > 12926 root 15 0 91196 24m 5064 S 1.0 0.7 2:34.81 mono > > 12926 root 17 0 91772 24m 5064 S 15.0 0.7 2:35.26 mono > > 12926 root 15 0 91196 24m 5064 S 12.0 0.7 2:35.62 mono > > 12926 root 15 0 91500 23m 5064 S 3.7 0.7 2:35.73 mono > > 12926 root 15 0 91644 23m 5064 S 183.1 0.7 2:41.24 mono > > 12926 root 15 0 91628 23m 5064 S 191.9 0.7 2:47.01 mono > > 12926 root 15 0 91628 23m 5064 S 197.2 0.7 2:52.94 mono > > 12926 root 15 0 91612 23m 5064 S 198.9 0.7 2:58.92 mono > > 12926 root 15 0 91596 23m 5064 S 199.2 0.7 3:04.91 mono > > 12926 root 15 0 91596 23m 5064 S 199.5 0.7 3:10.91 mono > > 12926 root 15 0 91596 23m 5064 S 199.5 0.7 3:16.91 mono > > 12926 root 15 0 91708 23m 5064 S 155.0 0.7 3:21.57 mono > > 12926 root 15 0 91260 24m 5064 S 92.4 0.7 3:24.35 mono > > 12926 root 15 0 91260 24m 5064 S 193.2 0.7 3:30.16 mono > > 12926 root 15 0 91740 24m 5064 S 104.4 0.7 3:33.30 mono > > 12926 root 17 0 91740 24m 5064 S 10.6 0.7 3:33.62 mono > > 12926 root 15 0 91196 24m 5064 S 11.0 0.7 3:33.95 mono > > 12926 root 15 0 91804 24m 5064 S 153.0 0.7 3:38.55 mono > > 12926 root 15 0 91804 24m 5064 S 195.5 0.7 3:44.43 mono > > 12926 root 15 0 91804 24m 5064 S 197.9 0.7 3:50.38 mono > > 12926 root 15 0 91804 24m 5064 S 197.2 0.7 3:56.31 mono > > 12926 root 15 0 91804 24m 5064 S 197.9 0.7 4:02.26 mono > > 12926 root 15 0 91804 24m 5064 S 197.5 0.7 4:08.20 mono > > 12926 root 15 0 91804 24m 5064 S 196.2 0.7 4:14.10 mono > > 12926 root 15 0 91804 24m 5064 S 199.9 0.7 4:20.11 mono > > 12926 root 15 0 91804 24m 5064 S 198.2 0.7 4:26.07 mono > > 12926 root 19 0 91196 23m 5068 S 21.9 0.7 4:26.73 mono > > > > 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