So, Mike Stump said his update times with svn from toolchain.org were a
little slow.
I posited a few reasons why this might be, and just to publicly follow
up with some numbers, here is what i get from gcc.gnu.org after
remembering to convert with keyword support turned off :)
These are all do-nothing updates of the improved-aliasing branch, from
gcc.gnu.org, same remote partition (IE they are both on the same disk on
gcc.gnu.org). Real updates are faster with svn than cvs in all cases i
tried.
Checkouts will be about 30% slower with svn, just because it has to
write more data out to disk because of the working copy (those who want
no/faster working copy are free to use svk, or wait for 1.4. 1.3 was
scheduled to allow compressed/no working copy checkouts, but the Summer
of Code student didn't end up doing it :( ).
(I changed my hostname recently, and haven't restarted, hence the xauth
crap)
[EMAIL PROTECTED]:/mnt/gccstuff/cvs/gcc> time cvs -q update -dP
Warning: No xauth data; using fake authentication data for X11
forwarding.
real 0m38.089s
user 0m2.420s
sys 0m3.056s
[EMAIL PROTECTED]:/mnt/gccstuff/cvs/gcc> time cvs -q update -dP
Warning: No xauth data; using fake authentication data for X11
forwarding.
real 0m52.082s
user 0m2.392s
sys 0m3.328s
[EMAIL PROTECTED]:/mnt/gccstuff/cvs/gcc> time cvs -q update -dP
Warning: No xauth data; using fake authentication data for X11
forwarding.
real 0m38.181s
user 0m2.420s
sys 0m2.828s
[EMAIL PROTECTED]:/mnt/gccstuff/cvs/gcc>
(I don't know what to explain the middle one with either, but hey, such
is life :P)
[EMAIL PROTECTED]:/mnt/gccstuff/svn/improved-aliasing-branch> time svn
update
Warning: No xauth data; using fake authentication data for X11
forwarding.
At revision 83795.
real 0m57.799s
user 0m2.872s
sys 0m1.712s
[EMAIL PROTECTED]:/mnt/gccstuff/svn/improved-aliasing-branch> time svn
update
Warning: No xauth data; using fake authentication data for X11
forwarding.
At revision 83795.
real 0m19.425s
user 0m1.712s
sys 0m0.644s
[EMAIL PROTECTED]:/mnt/gccstuff/svn/improved-aliasing-branch> time svn
update
Warning: No xauth data; using fake authentication data for X11
forwarding.
At revision 83795.
real 0m19.687s
user 0m1.992s
sys 0m0.724s
[EMAIL PROTECTED]:/mnt/gccstuff/svn/improved-aliasing-branch> cd ../../cvs/
So the first svn update took 57 seconds, and did nothing
The second two took 19 seconds each.
I posit this is because:
1. the first time svn ran, it had to stat a lot of files, and this
wasn't in the stat cache.
It then asked went out for the newest revision number of the repo, the
repo said "83795", and it said "Hey, cool, i'm done"
2. The next two times, the stat'ing took less time becuase it was in
cache, and the network time was negligible.
CVS was probably getting eaten by network traffic one of the times i ran
it, plus possibly stat times.
Who knows. :)
Time to switch to HEAD from my improved-aliasing-branch
time cvs -q update -rHEAD -dP
...
real 2m28.183s
user 0m55.679s
sys 0m25.410s
time svn switch svn+ssh://gcc.gnu.org/export/u0/gccsvn/gccrepo/trunk
real 2m34.380s
user 0m12.429s
sys 0m13.885s
Mike, if you have shell access to gcc.gnu.org, try svn co svn
+ssh://gcc.gnu.org/export/u0/gccsvn/gccrepo/trunk
Let me know if it's still slow for you.
(I'd recommend a 1.2.x client, or 1.3.x in a few weeks. 1.2.x has much
fsater working copy than 1.2.x)
