Re: [clisp-list] get-internal-run-time and time macros with MT

[Fred C. <fc...@al...>]

There may be applications that would want to know times for threads for
things like timeouts, real-time processing, optimization, limited
investment in one of many strategies, etc. This is done during operation
so that the process can make decisions as it operates about what to do
next, and so that other processes can exchange such data for more global
decisions.

FC

On 10/20/10 7:56 AM, Sam Steingold wrote:
> Don Cohen wrote:
>> I don't see any doc describing how get-internal-run-time works
>> in the presence of MT.  I suppose it should measure the total
>> run time for all threads, and that total might advance faster than
>> real time. 
> 
> I think so.
> 
>> It occurs to me that it would be nice to be able to measure the run
>> time in a single thread.  Similarly the time macro would seem more
>> useful if it only measured the time spent in a single thread.
>> However, it might make more sense to define a separate mt time macro
>> to do that.
> 
> What are the use cases?
> 
> 1. Profiling. This is done during development, so the programmer can make sure 
> that only one thread is busy; the current behavior of reporting global time and 
> allocations (for TIMES) is appropriate. While it is conceivable that a user 
> might want to profile a specific thread (other than the current one), I am not 
> sure this is worth the extra effort.
> 
> 2. Progress reporting. I think it would be nice to be able to report the run 
> time for individual threads.
> Either get-internal-run-time should return 2 values: global and local to this 
> thread, or it should take an optional thread argument and return global time by 
> default and the time for the specified thread otherwise.
> I am not sure that the second interface is feasible (i.e., whether both unix 
> and win32 allow timing of other threads).
> 
> Sam.
> 
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