Hello, I was wondering if it's somehow possible to obtain the output from pfmon unbuffered during sampling.
What I want to do is to monitor a program's miss rate in real time with pfmon using the following invocation: pfmon --attach-task <pid of the program to monitor> --smpl-module=compact --smpl-entries=1 --long-smpl-periods=100000000 --follow-all --aggregate-results -0 -3 -eUNHALTED_CORE_CYCLES,L2_LINES_IN:SELF When I type it in the terminal, all is fine and strings for each sample show up in real time as soon as they are available. Problems start when I try to obtain the same results within c program. For that I create pipe and then redirect pfmon's stdout into this pipe. in this case, the results show not in real time, but buffered as 4k blocks, i.e. only after a block is full, it's being shown on the other side of the pipe. The same output with delays between the blocks can be obtained by issuing the following command: pfmon --attach-task <pid of the program to monitor> --smpl-module=compact --smpl-entries=1 --long-smpl-periods=100000000 --follow-all --aggregate-results -0 -3 -eUNHALTED_CORE_CYCLES,L2_LINES_IN:SELF | cat or by writing into the sample file with --smpl-outfile option: pfmon --attach-task <pid of the program to monitor> --smpl-module=compact --smpl-entries=1 --long-smpl-periods=100000000 --follow-all --aggregate-results -0 -3 -eUNHALTED_CORE_CYCLES,L2_LINES_IN:SELF --smpl-outfile=pfmon.log At first I thought that the problem is in the pipe itself. However, the output from some other commands doesn't have this same feature. For example, the following command brings lines as soon as they appear without any kind of buffering: ping 127.0.0.1 | cat Any ideas how I can solve this issue are greatly appreciated. Thank you! -- Sincerely, Sergey Blagodurov ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
