Jeff Squyres a écrit :
> On Jun 5, 2005, at 1:18 PM, Pierre Valiron wrote:
>
>> I suppose lamhalt post some asynchronous request to the daemon, and
>> if the TMPDIR is deleted too quickly the daemon is prevented to
>> halt. If I add some sleep between lamhalt and rm the daemon is
>> generally properly halted.
>
>
> This is exactly what is happening. Generally, when you lamhalt, it
> takes 1-4 seconds for the LAM universe to finish coming down *after*
> lamhalt returns. Some relatively uninteresting daemon ordering issues
> are the cause of this -- search this list's archives for discussions
> about it, if you care.
>
>> Of course there is a workaround using
>>
>> export LAM_MPI_SESSION_PREFIX="/some/permanent/path"
>> export LAM_MPI_SESSION_SUFFIX="some_unique_name"
>
>
> I'm a little confused -- this should suffer exactly the same problem
> as you described above. The mechanism for where LAM's session
> directory is located/found does not affect the takedown time of lamhalt.
I don't agree.
If the daemons are attached to a volatile directory, lamhalt comes into
trouble when the directory is destroyed. If the deamons are attached to
a permanent one, then lamhalt gets all the time he needs to kill the lam
universe and remove the corresponding files.
>
>> However it is elegant to use the unique TMPDIR to trigger a unique
>> LAM universe... and this should work, or if it can't be fixed for
>> some reason the doc should be updated accordingly.
>
>
> You're probably right; this has bitten enough people that we should do
> something about it.
>
> However, I literally just noticed that the LAM tarballs do not include
> the lamhalt man page (it exists -- I swear it!). !@#$@!$!!
>
> I'll go fix that for 7.1.2...
>
Thanks !
Best regards.
Pierre.
--
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