Prism User's Guide - CSAIL People - MIT
Prism User's Guide - CSAIL People - MIT
Prism User's Guide - CSAIL People - MIT
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108 <strong>Prism</strong> User 's <strong>Guide</strong><br />
• FE Total is the total of these resources. It represents the program's use of<br />
the front-end subsystem.<br />
* CM cpu (user) - This is the time that the program spent in processing<br />
on the CM. It refers to the amount of time any CM processor was active.<br />
* CM cpu (system) - This is CM CPU time used by the operating system<br />
on behalf of the program.<br />
* Comm (Send/Get) - This is the time that the program spent in router<br />
communication (sends and gets) on the CM.<br />
* Comm (NEWS) - This is the time that the program spent in NEWS communication<br />
(also referred to as grid communication) on the CM.<br />
* Comm (Reductions) - This is the time that the program spent doing data<br />
reductions on the CM.<br />
* Comm (FECM) - This is the time spent in communication between<br />
the front end and the CM processors.<br />
* CM I/O - This is the time spent in /O between the CM processors and<br />
I/O devices. (<br />
* CM not profiled - This is the time spent on the CM by routines that<br />
weren't compiled with the -cmprofile option. (These include routines<br />
in CM libraries such as CMSSL.) If the routine had been compiled with<br />
-cmprofile, this time would be allocated to the other CM resources.<br />
This resource is not displayed for CM-2/200 C* programs or CM Fortran<br />
programs prior to Version 2.1; for these programs, CM time in routines not<br />
compiled with -cmprof ile is not measured.<br />
* CM Total is the total of these resources. It represents the program's use<br />
of the CM subsystem.<br />
The total use of the front-end subsystem can be less than or equal to 100 percent.<br />
Typically, it will be less than 100 percent, because there will be times when the<br />
CM is busy and the front end is not.<br />
The total use of the CM subsystem can also be less than or equal to 100 percent.<br />
The difference between the total and 100 percent is time during which the CM<br />
is idle. To use the CM efficiently, CM idle time should be kept as low as possible.<br />
Note that the use of front-end resources and CM resources can each sum to 100<br />
percent, because both can be busy all the time a program is executing.<br />
Version 1.2, March 1993<br />
Copyright ) 1993 Thinking Machines Corporation
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