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Pthreads and top command
Hi All,
-- Simple question/Sanity check --
When running a multithreaded program, with Pthreads, and observing it with the linux top command, I should see %CPU go above 100%, right? Would I ever expect to see multiple versions of my program never exceeding 100%?
-- More Detail --
I have been running an MPI program and wanted to use Pthreads to process some of the data in parallel. I noticed a big slow down when I added in Pthreads. I also noticed that the top command only ever show 99% usage on one program. Think it may be related to this (http://mail.cse.ohio-state.edu/pipermail/mvapich-discuss/2007-November/001248.html). Anyone else have an idea why this could be? Background thread only loads and preprocess the data, only briefly holds a mutex.
Thanks!
-- Simple question/Sanity check --
When running a multithreaded program, with Pthreads, and observing it with the linux top command, I should see %CPU go above 100%, right? Would I ever expect to see multiple versions of my program never exceeding 100%?
-- More Detail --
I have been running an MPI program and wanted to use Pthreads to process some of the data in parallel. I noticed a big slow down when I added in Pthreads. I also noticed that the top command only ever show 99% usage on one program. Think it may be related to this (http://mail.cse.ohio-state.edu/pipermail/mvapich-discuss/2007-November/001248.html). Anyone else have an idea why this could be? Background thread only loads and preprocess the data, only briefly holds a mutex.
Thanks!
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