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Special Forums UNIX and Linux Applications High Performance Computing Memory Barriers for (Ubuntu) Linux (i686) Post 302430460 by gorga on Thursday 17th of June 2010 05:09:10 PM
Old 06-17-2010
Quote:
Your readers could spend a lot of time scanning a mostly-empty list, and your writer could spend a lot of time scanning a mostly-full one.
I've accounted for that possibility in the elaborate design of the "task-queues", (trust me on this).

Quote:
That's a lot of time wasted, you'd be much better off just using a normal one-writer-many-reader queue. It won't block when there's lots of work, and will actually put threads to sleep when there's none, instead of everything spinlocking forever.
The "thread-pool" is a customised in design, dedicated for the application sitting atop of it. This application generates a high number of tasks, and possesses much implicit parallelism. I originally used it with existing thread-pools, but found I needed more control over the allocation of "tasks" to "cores", hence I'm making my own. When there is no work it means there is no work in the application, so that's okay.

After reading your post, I think I'll run with the atomics, see how that fares. Thanks for your help (again).
 

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RUNLIM(1)						      General Commands Manual							 RUNLIM(1)

NAME
runlim - a program to run benchmarks SYNOPSIS
runlim [ options ...] command [ arguments ...] DESCRIPTION
run is a tool that can be used to run and control benchmarks. It executes a given command with (optional) arguments, samples resource usage during the run, and kills the process (and its child processes) if a certain time and/or space limit is exhausted. Every 100 milliseconds, runlim takes a sample of the program's resource utilization, and logs status information to stderr every second. Optionally, the status can be logged to a file. Multi-threaded programs can be limited by setting a wall clock timeout. runlim follows the time accumulation scheme of GNU time for multi- threaded programs and programs that spawn multiple child-processes: time spent in each thread/child is summed up, unless you are only interested in walk clock time. OPTIONS
runlim accepts the following options: -h, --help Show summary of options. --version Show version of program. -o FILE, --output-file=FILE Overwrite or create FILE for output logging. -s NUM, --space-limit=NUM Set space limit to NUM megabytes. -t NUM, --time-limit=NUM Set time limit to NUM seconds. -r NUM, --real-time-limit=NUM Set real time limit to NUM seconds. -k, --kill Propagate signals. SEE ALSO
time(1), timelimit(1), timeout(1), time(7). AUTHOR
runlim was written by Armin Biere and Toni Jussila. This manual page was written by Thomas Krennwallner <tkren@kr.tuwien.ac.at>, for the Debian project (and may be used by others). February 11, 2011 RUNLIM(1)
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