Re: (ITS#7566) ldapadd slower on Linux than BSD

[lm5@ualberta.ca]

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>
> I noticed something similar on ubuntu10 as well.  I upgraded my server to
> ubuntu12, and I also set /proc/sys/vm/dirty_ratio to 90 and
> /proc/sys/vm/dirty_expire_centisecs to 60000, and that helped significantly
> with back-mdb using current OpenLDAP master.  An ldapadd of almost 3.5
> million users takes approximately 4 hours now for my dataset vs 16.  so 4x
> faster.
>

Thank you for your suggestions. I tried these two settings and ldapadd
wrote 3 GB in 8 hours (out of 4.3 GB). How big is your database ?

Have you considered running the database from a ramdisk ? Using ramfs in
Linux, I got the fastest times on all the tests I tried.

Leo Mocofan

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c=
cc solid;padding-left:1ex"><div><div>I noticed something similar on ubuntu1=
0 as well. =A0I upgraded my server to<br>


ubuntu12, and I also set /proc/sys/vm/dirty_ratio to 90 and<br>
/proc/sys/vm/dirty_expire_centisecs to 60000, and that helped significantly=
<br>
with back-mdb using current OpenLDAP master. =A0An ldapadd of almost 3.5<br=
>
million users takes approximately 4 hours now for my dataset vs 16. =A0so 4=
x<br>
faster.<br></div></div></blockquote><div><br></div><div>Thank you for your =
suggestions. I tried these two settings and ldapadd wrote 3 GB in 8 hours (=
out of 4.3 GB). How big is your database ?<br><br></div><div>Have you consi=
dered running the database from a ramdisk ? Using ramfs in Linux, I got the=
 fastest times on all the tests I tried.<br>
<br></div><div>Leo Mocofan<br></div><div><br></div></div></div></div>

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