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Special Forums UNIX and Linux Applications High Performance Computing Memory Barriers for (Ubuntu) Linux (i686) Post 302430786 by fpmurphy on Friday 18th of June 2010 05:33:24 PM
Old 06-18-2010
Quote:
You're referring to Next Generation Posix Threads developed by IBM though. I'm not sure but wasn't this abandoned in favour of simpler 1:1 threading in NPTL? But anyway, I needed something with more control than was on offer with something featuring a standard posix api.
NGPT was developed by a small team which included some people - Bill Abt, for example - from IBM. Work was funded by IBM so IBM got the kludos. Yes NGPT was shelved at v2.2 in favor of NPTL. For a while we looked at scheduler activations (see New GNU thread library) but then moved away from that concept towards a 1x1 model as proposed by Ingo Molnar. NPTL has been proven in numerous benchmarks to satisfactorily scale to tens of thousands of threads of execution.

Frankly if you wish to scale to tens of thousands of threads you have lots more problems to worry about than what you have discussed so far. See The C10K problem for example.

BTW, an alternative approach to scaling your application might be use something like CUDA and offload the application to a GPU. Hugh performance gains can be achieved if you can solve the parallel programming issues. Another approach might be to use a multithreaded parallel programming language such as Intel's CILK.
 

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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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