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List: unison-users
Subject: Re: [unison-users] Synchronization of file while local copy is in progress
From: "'Benjamin C. Pierce' bcpierce () cis ! upenn ! edu [unison-users]" <unison-users-norep
Date: 2014-10-22 19:27:17
Message-ID: 496913AD-3B8B-40B4-8617-9B2A3ED390E2 () cis ! upenn ! edu
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Looks like the function to fix is safeFingerprint, in module os.ml. Possible fix is \
to add a short sleep before retrying (i.e., before the first call to retryLoop).
Simpler workaround is to reduce the number of retries (to 1 or 2, say, from 10).
- Benjamin
On Oct 22, 2014, at 3:15 PM, rcollinson@att.net [unison-users] \
<unison-users-noreply@yahoogroups.com> wrote:
>
>
> Wondering if there is a way to hold Unison off from calculating its hash when a new \
> file is being copied into a synchronization folder?
>
>
> If a file is open and is being changed from a copy operation, could Unison ignore \
> it until it is no longer open?
>
>
> What I am seeing is CPU utilization spike with Unison during the copy of a file to \
> a folder that is designated for synchronization.
>
>
> It appears that the synchronization (copy to other computer) is delayed until the \
> local copy is complete, but the hash calculation is constantly being performed, \
> hence high CPU utilization, before the local copy is complete.
>
>
> Does Unison check if a file is open and being modified before calculating the hash \
> or determining if directories are different?
>
>
>
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<p>Looks like the function to fix is safeFingerprint, in module os.ml. \
Possible fix is to add a short sleep before retrying (i.e., before the first \
call to retryLoop).<div><br></div><div>Simpler workaround is to reduce the number of \
retries (to 1 or 2, say, from 10).</div><div><br></div><div> - \
Benjamin</div><div><br><div><br><div><br><div><div>On Oct 22, 2014, at 3:15 PM, <a \
href="mailto:rcollinson@att.net">rcollinson@att.net</a> [unison-users] <<a \
href="mailto:unison-users-noreply@yahoogroups.com">unison-users-noreply@yahoogroups.com</a>> \
wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div \
style="font-family: Helvetica;font-size: 18px;font-style: normal;font-variant: \
normal;font-weight: normal;letter-spacing: normal;text-align: start;text-indent: \
0px;text-transform: none;white-space: normal;"><br><br><p style="padding: 15px 0px \
3px;overflow: hidden;"><span>Wondering if there is a way to hold Unison off from \
calculating its hash when a new file is being copied into a synchronization \
folder?</span></p><p style="padding: 15px 0px 3px;overflow: \
hidden;"><span><br></span></p><p style="padding: 15px 0px 3px;overflow: \
hidden;"><span>If a file is open and is being changed from a copy operation, could \
Unison ignore it until it is no longer open?</span></p><p style="padding: 15px 0px \
3px;overflow: hidden;"><span><br></span></p><p style="padding: 15px 0px 3px;overflow: \
hidden;"><span>What I am seeing is CPU utilization spike with Unison during the copy \
of a file to a folder that is designated for synchronization.</span></p><p \
style="padding: 15px 0px 3px;overflow: hidden;"><span><br></span></p><p \
style="padding: 15px 0px 3px;overflow: hidden;"><span>It appears that the \
synchronization (copy to other computer) is delayed until the local copy is complete, \
but the hash calculation is constantly being performed, hence high CPU utilization, \
before the local copy is complete.</span></p><p style="padding: 15px 0px \
3px;overflow: hidden;"><span><br></span></p><p style="padding: 15px 0px 3px;overflow: \
hidden;"><span>Does Unison check if a file is open and being modified before \
calculating the hash or determining if directories are \
different?</span></p><br><br><div width="1" style="color: \
white;"></div></div></blockquote></div><br></div></div></div></p>
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