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Parallel package: Difference between revisions
→calculation on a single array: fix formatting (no newlines between <pre> and <code>)
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</pre> | </pre> | ||
}} | }} | ||
should output | should output | ||
<code> | <code><pre> | ||
<pre> | |||
parcellfun: 10/10 jobs done | parcellfun: 10/10 jobs done | ||
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1 4 9 16 25 36 49 64 81 100 | 1 4 9 16 25 36 49 64 81 100 | ||
</pre> | </pre></code> | ||
</code> | |||
{{Codeline|nproc}} returns the number of cpus available (number of cores or twice as much with hyperthreading). One can use {{Codeline|nproc - 1}} instead, in order to leave one cpu free for instance. | {{Codeline|nproc}} returns the number of cpus available (number of cores or twice as much with hyperthreading). One can use {{Codeline|nproc - 1}} instead, in order to leave one cpu free for instance. | ||
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should output | should output | ||
<code> | <code><pre> | ||
<pre> | |||
parcellfun: 4/4 jobs done | parcellfun: 4/4 jobs done | ||
vector_y = | vector_y = | ||
1 4 9 16 25 36 49 64 81 100 | 1 4 9 16 25 36 49 64 81 100 | ||
</pre> | </pre></code> | ||
</code> | |||
The {{Codeline|"ChunksPerProc"}} option is mandatory with {{Codeline|"Vectorized", true}}. {{Codeline|1}} means that each proc will do its job in one shot (chunk). This number can be increased to use less memory for instance. A higher number of {{Codeline|"ChunksPerProc"}} allows also more flexibility in case of long calculations on a busy machine. If one cpu has finished all its jobs, it can take over the pending jobs of another. | The {{Codeline|"ChunksPerProc"}} option is mandatory with {{Codeline|"Vectorized", true}}. {{Codeline|1}} means that each proc will do its job in one shot (chunk). This number can be increased to use less memory for instance. A higher number of {{Codeline|"ChunksPerProc"}} allows also more flexibility in case of long calculations on a busy machine. If one cpu has finished all its jobs, it can take over the pending jobs of another. | ||