> > On 2014-10-21 12:40:56 +0530, Amit Kapila wrote: > > While doing performance tests, I noticed a hang at higher client > > counts with patch. I have tried to check call stack for few of > > processes and it is as below: > > > > #0 0x0000008010933e54 in .semop () from /lib64/libc.so.6 > > #1 0x0000000010286e48 in .PGSemaphoreLock () > > #2 0x00000000102f68bc in .LWLockAcquire () > > #3 0x00000000102d1ca0 in .ReadBuffer_common () > > #4 0x00000000102d2ae0 in .ReadBufferExtended () > > #5 0x00000000100a57d8 in ._bt_getbuf () > > #6 0x00000000100a6210 in ._bt_getroot () > > #7 0x00000000100aa910 in ._bt_search () > > #8 0x00000000100ab494 in ._bt_first () > > #9 0x00000000100a8e84 in .btgettuple () > > .. > > > > #0 0x0000008010933e54 in .semop () from /lib64/libc.so.6 > > #1 0x0000000010286e48 in .PGSemaphoreLock () > > #2 0x00000000102f68bc in .LWLockAcquire () > > #3 0x00000000102d1ca0 in .ReadBuffer_common () > > #4 0x00000000102d2ae0 in .ReadBufferExtended () > > #5 0x00000000100a57d8 in ._bt_getbuf () > > #6 0x00000000100a6210 in ._bt_getroot () > > #7 0x00000000100aa910 in ._bt_search () > > #8 0x00000000100ab494 in ._bt_first () > > ... > > > > The test configuration is as below: > > Test env - Power - 7 (hydra) > > scale_factor - 3000 > > shared_buffers - 8GB > > test mode - pgbench read only > > > > test execution - > > ./pgbench -c 128 -j 128 -T 1800 -S -M prepared postgres > > > > I have ran it for half an hour, but it doesn't came out even after > > ~2 hours. It doesn't get reproduced every time, currently I am > > able to reproduce it and the m/c is in same state, if you want any > > info, let me know (unfortunately binaries are in release mode, so > > might not get enough information). > > Hm. What commit did you apply the series ontop? I managed to reproduce a > hang, but it was just something that heikki had already fixed... >
