Messages in this thread - First message in thread
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- "Bayduraev, Alexey V"
- Jiri Olsa
| | | Date | Thu, 8 Apr 2021 07:25:33 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH v4 09/12] perf record: document parallel data streaming mode |
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> +--threads=<spec>:: > +Write collected trace data into several data files using parallel threads. > +<spec> value can be user defined list of masks. Masks separated by colon > +define cpus to be monitored by a thread and affinity mask of that thread > +is separated by slash. For example user specification like the following: > +<cpus mask 1>/<affinity mask 1>:<cpu mask 2>/<affinity mask 2> specifies
You need to be more clear on the exact syntax of a mask. Ideally some full examples too.
> +parallel threads layout that consists of two threads with corresponding > +assigned cpus to be monitored. <spec> value can also be a string meaning > +predefined parallel threads layout: > + cpu - create new data streaming thread for every monitored cpu > + core - create new thread to monitor cpus grouped by a core > + socket - create new thread to monitor cpus grouped by a socket > + numa - create new threed to monitor cpus grouped by a numa domain > +Predefined layouts can be used on systems with large number of cpus in > +order not to spawn multiple per-cpu streaming threads but still avoid LOST > +events in data directory files. Option specified with no or empty value > +defaults to cpu layout. Masks defined or provided by the option value are > +filtered through the mask provided by -C option. > > >
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