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performancebashperf

Using perf command for an application which reads input file

Some applications read input file via < character. For example,

./run_rog < input.txt

However passing the input file in such a way is invalid for perf command.

perf stat -e instructions ./run_prog < input.txt
Failed opening logfd: Invalid argument

How can I fix that?

Solution

  • According to this source

    When running perf-stat in certain shell environments with stdout redirection there is a logging file descriptor setup failure:

    Failed opening logfd: Invalid argument

    Apparently, the perf tool needs applying a patch for solving this issue.

    PS: Tried reproducing your problem with:

    $ > perf --version
perf version 2.6.32-431.11.2.el6.x86_64.debug

    Got no issue:

    $ > echo 'Test my perf' > input.txt
$ > perf stat -e instructions cat < input.txt
Test my perf

Performance counter stats for 'cat':

       580,283 instructions              #    0.00  insns per cycle

   0.003284129 seconds time elapsed