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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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