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Re: (ITS#4702) out-of-memory on huge DB ?
by hyc＠symas.com 08 Oct '06

08 Oct '06

Paolo Rossi wrote: > >> PS: 4GB of RAM is probably not enough for a 20GB database, you won't >> be able to configure caches large enough to get decent search >> performance. I think 8GB would be a practical minimum here. >> > > This is also my opinion, for good performances are not sufficient, but > now the question is: > 4GB are not enough to anyway, to run (slowly) similar huge server > without coredump? > > p.s. or maybe I missed something, somewhere... :P > What is your entry cache size? I suggest you set it to something small, like 100, during the slapcat test. -- -- Howard Chu Chief Architect, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc OpenLDAP Core Team http://www.openldap.org/project/

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Re: (ITS#4702) out-of-memory on huge DB ?
by Paolo.Rossi.con＠h3g.it 08 Oct '06

08 Oct '06

> 4GB is the memory limit on 32-bit Solaris, IIRC. Just like it is > 2GB on 32-bit linux. Try building everything 64-bit. I'll give a check. > Another thing to try, from when I ran my servers on Solaris, is to > fix the limits in /etc/system for the maximum amount of memory that > can be allocated. I vaguely recall having to do this for my > Solaris systems. uhm, maybe you referred "data seg size" ? now, is set to "unlimited" now I'm trying with ulimit -d 1024000, but now slapd have reached 1106MB > Oh, and with BDB on Solaris, you want to use the "shm_key" flag in > slapd.conf to use shared memory segments, when running on SPARC. > Here's the last portions of /etc/system on my old Solaris LDAP > servers: > > * turn off executable stacks > set noexec_user_stack = 1 > set noexec_user_stack_log = 1 > * increase the size of the kernel stack to 24k for Solaris 8/64-bit > set rpcmod:svc_default_stksize=0x6000 > set lwp_default_stksize=0x6000 > * force load the shared module kernel information. > forceload: sys/shmsys > * allow shared memory segments of up to 3 GB (default 1MB) > * See http://www.sun.com/sun-on-net/itworld/UIR960101perf.html > set shmsys:shminfo_shmmax=3221225472 > * Increase memory performance when filesystem is being heavily used. > * See http://www.sun.com/sun-on-net/performance/priority_paging.html > set priority_paging=1 > * Increase memory performance when filesystem is being heavily used. > * See http://www.samag.com/documents/s=1323/sam0110e/0110e.htm > set maxpgio=25468 > set slowscan=500 > * autoup influences how much RAM is checked by fsflush every 5 > seconds. > * Default = 30. Increase autoup to decrease mem management overhead. > * See http://docs.sun.com/db/doc/806-7009/6jftnqsin?a=view > set autoup = 60 > * Up tcp conn hash size. Defaults to 256. > * See http://www.deny-all.com/en/solsecu/tech/tuning.html > set tcp:tcp_conn_hash_size = 16384 > * Up file descriptor limit. Defaults to 1024. > set rlim_fd_max = 16384 > This is mine: set shmsys:shminfo_shmmax=2147483648 set shmsys:shminfo_shmmin=100 set shmsys:shminfo_shmmni=100 set shmsys:shminfo_shmseg=100 set semsys:seminfo_semmap=64 set semsys:seminfo_semmni=4096 set semsys:seminfo_semmns=4096 set semsys:seminfo_semmnu=4096 set semsys:seminfo_semume=64 set semsys:seminfo_semmsl=100 Thx for details, I will cross check if I miss somethings Paolo Rossi

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Re: (ITS#4702) out-of-memory on huge DB ?
by Paolo.Rossi.con＠h3g.it 08 Oct '06

08 Oct '06

> PS: 4GB of RAM is probably not enough for a 20GB database, you > won't be able to configure caches large enough to get decent search > performance. I think 8GB would be a practical minimum here. > This is also my opinion, for good performances are not sufficient, but now the question is: 4GB are not enough to anyway, to run (slowly) similar huge server without coredump? p.s. or maybe I missed something, somewhere... :P Thx Paolo Rossi

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Re: (ITS#4702) out-of-memory on huge DB ?
by Paolo.Rossi.con＠h3g.it 08 Oct '06

08 Oct '06

--Apple-Mail-1--548387425 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Il giorno 08/ott/06, alle ore 06:35, Howard Chu ha scritto: > No ideas, this problem doesn't occur on my Linux system. We've > slapadd'd and slapcat'd databases of over a terabyte in size, with > hundreds of millions of entries, and never seen slapcat grow beyond > the size of the BDB cache. cool :) > How large is your cache in DB_CONFIG? Here the entry my DB_CONFIG: set_cachesize 0 512000000 1 set_lg_regionmax 262144 set_lg_bsize 2097152 and, yes, I use shm_key in slapd.conf Thx for reply Paolo Rossi --Apple-Mail-1--548387425 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 <HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; = -khtml-line-break: after-white-space; "><BR><DIV><DIV>Il giorno = 08/ott/06, alle ore 06:35, Howard Chu ha scritto:</DIV><BR = class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">No ideas, this problem doesn't occur on my Linux = system. We've slapadd'd and slapcat'd databases of over a terabyte in = size, with hundreds of millions of entries, and never seen slapcat grow = beyond the size of the BDB cache. <BR></DIV></BLOCKQUOTE><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>cool = :)</DIV><BR><BLOCKQUOTE type=3D"cite"><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">How large is = your cache in DB_CONFIG?</DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: = 14px; "></DIV></BLOCKQUOTE><BR></DIV><DIV>Here the entry my = DB_CONFIG:</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV><SPAN = class=3D"Apple-tab-span" style=3D"white-space:pre"> = </SPAN>set_cachesize 0 512000000 1 </DIV><DIV><SPAN = class=3D"Apple-tab-span" style=3D"white-space:pre"> = </SPAN>set_lg_regionmax 262144 </DIV><DIV><SPAN class=3D"Apple-tab-span" = style=3D"white-space:pre"> </SPAN>set_lg_bsize 2097152 = </DIV><DIV><BR class=3D"khtml-block-placeholder"></DIV><DIV><SPAN = class=3D"Apple-style-span" style=3D"border-collapse: separate; = border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; = font-size: 15px; font-style: normal; font-variant: normal; font-weight: = normal; letter-spacing: normal; line-height: normal; text-align: auto; = -khtml-text-decorations-in-effect: none; text-indent: 0px; = -apple-text-size-adjust: auto; text-transform: none; orphans: 2; = white-space: normal; widows: 2; word-spacing: 0px; ">and, yes, I use = shm_key in slapd.conf=A0<BR class=3D"Apple-interchange-newline"></SPAN> = </DIV><DIV><BR class=3D"khtml-block-placeholder"></DIV><DIV>Thx for = reply</DIV><DIV><BR class=3D"khtml-block-placeholder"></DIV>Paolo = Rossi<BR></BODY></HTML>= --Apple-Mail-1--548387425--

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Re: (ITS#4702) out-of-memory on huge DB ?
by quanah＠stanford.edu 08 Oct '06

08 Oct '06

--On Sunday, October 08, 2006 4:35 AM +0000 hyc(a)symas.com wrote: >> Then I've tried to syncrepl the entire DB, turning on the empty >> consumers (crazy idea ;) i know ) but the provider memory allocated, >> again reached 4GB and... bum >> >> some ideas? 4GB is the memory limit on 32-bit Solaris, IIRC. Just like it is 2GB on 32-bit linux. Try building everything 64-bit. Another thing to try, from when I ran my servers on Solaris, is to fix the limits in /etc/system for the maximum amount of memory that can be allocated. I vaguely recall having to do this for my Solaris systems. Oh, and with BDB on Solaris, you want to use the "shm_key" flag in slapd.conf to use shared memory segments, when running on SPARC. Here's the last portions of /etc/system on my old Solaris LDAP servers: * turn off executable stacks set noexec_user_stack = 1 set noexec_user_stack_log = 1 * increase the size of the kernel stack to 24k for Solaris 8/64-bit set rpcmod:svc_default_stksize=0x6000 set lwp_default_stksize=0x6000 * force load the shared module kernel information. forceload: sys/shmsys * allow shared memory segments of up to 3 GB (default 1MB) * See http://www.sun.com/sun-on-net/itworld/UIR960101perf.html set shmsys:shminfo_shmmax=3221225472 * Increase memory performance when filesystem is being heavily used. * See http://www.sun.com/sun-on-net/performance/priority_paging.html set priority_paging=1 * Increase memory performance when filesystem is being heavily used. * See http://www.samag.com/documents/s=1323/sam0110e/0110e.htm set maxpgio=25468 set slowscan=500 * autoup influences how much RAM is checked by fsflush every 5 seconds. * Default = 30. Increase autoup to decrease mem management overhead. * See http://docs.sun.com/db/doc/806-7009/6jftnqsin?a=view set autoup = 60 * Up tcp conn hash size. Defaults to 256. * See http://www.deny-all.com/en/solsecu/tech/tuning.html set tcp:tcp_conn_hash_size = 16384 * Up file descriptor limit. Defaults to 1024. set rlim_fd_max = 16384 --Quanah -- Quanah Gibson-Mount Principal Software Developer ITS/Shared Application Services Stanford University GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html

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Re: (ITS#4702) out-of-memory on huge DB ?
by hyc＠symas.com 08 Oct '06

08 Oct '06

PS: 4GB of RAM is probably not enough for a 20GB database, you won't be able to configure caches large enough to get decent search performance. I think 8GB would be a practical minimum here. Paolo.Rossi.con(a)h3g.it wrote: > Full_Name: Paolo Rossi > Version: 2.3.27 > OS: Solaris 8 > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (88.149.168.114) > > > Hi, during some test on very huge DB, due to see how syncrepl works in this > scenario, I've found a strange behavior: > > Solaris 8 on 2xUSIII+ 4GB RAM > openLDAP 2.3.27 > BDB 4.2.52.4 > > backend hdb > > 1 provider, 1 consumer, 1 consumer with filter. > > on 1 million dn LDAP whit 2 sub-dn for each dn, all the systems works fine, > when I've tried to use a 10m dn with 3 sub-dn (very big ldap, openldap-data dir > about 20GB): -- -- Howard Chu Chief Architect, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc OpenLDAP Core Team http://www.openldap.org/project/

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Re: (ITS#4702) out-of-memory on huge DB ?
by hyc＠symas.com 08 Oct '06

08 Oct '06

No ideas, this problem doesn't occur on my Linux system. We've slapadd'd and slapcat'd databases of over a terabyte in size, with hundreds of millions of entries, and never seen slapcat grow beyond the size of the BDB cache. How large is your cache in DB_CONFIG? Paolo.Rossi.con(a)h3g.it wrote: > Full_Name: Paolo Rossi > Version: 2.3.27 > OS: Solaris 8 > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (88.149.168.114) > > > Hi, during some test on very huge DB, due to see how syncrepl works in this > scenario, I've found a strange behavior: > > Solaris 8 on 2xUSIII+ 4GB RAM > openLDAP 2.3.27 > BDB 4.2.52.4 > > backend hdb > > 1 provider, 1 consumer, 1 consumer with filter. > > on 1 million dn LDAP whit 2 sub-dn for each dn, all the systems works fine, > when I've tried to use a 10m dn with 3 sub-dn (very big ldap, openldap-data dir > about 20GB): > > slapadd with -w on producer. it works. > some ldapsearch, it works. > > stop producer, > slapcat the producer to obtain the ldif for consumer preload and... bum > > after about 150 minutes of slapcat, memory full (look the screenshot of top ) > > PID |USERNAME | SIZE |RES |TIME | CPU |COMMAND > 21495 | ldap |4072M |3591M |150:07 | 21.36% |slapd > > memory full, then coredump and a console messages: > > ch_malloc of 16392 bytes failed > ch_malloc.c:57: failed assertion `0' > > the out ldif was about 85% of the full LDAP > > I've tried again with same results. > > > Then I've tried to syncrepl the entire DB, turning on the empty consumers (crazy > idea ;) i know ) but the provider memory allocated, again reached 4GB and... > bum > > core dumped > > in the slapd.log > > ch_calloc of 1 elems of 80 bytes failed > > second try: > ch_malloc of 16 bytes failed > > seems to be a issue like ITS#4010 > > some ideas? > > Regards -- -- Howard Chu Chief Architect, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc OpenLDAP Core Team http://www.openldap.org/project/

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Re: (ITS#4695) syncrepl modrdn failing with garbage returned by bdb_dn2entry
by richton＠nbcs.rutgers.edu 06 Oct '06

06 Oct '06

Rutgers just ran into this earlier today, fix (from RE23 CVS) verified on an x86_64 client, will try on sparc later (likely next week).

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(ITS#4703) mirrormode hole
by hyc＠OpenLDAP.org 06 Oct '06

06 Oct '06

Full_Name: Howard Chu Version: HEAD/re24 OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (24.126.120.178) Submitted by: hyc If the current master commits an update but crashes before the change is propagated to the mirror, and then new updates are subsequently committed on the new master, the non-propagated changes will never be picked up, because the new master's context is newer than everything on the crashed master. The hole can be plugged by keeping a per-consumer contextCSN in addition to the overall contextCSN, so that the old state isn't lost. While we're at it, we should add a consumer option for specifying additional locations in which to store contextCSNs. This would e.g. solve ITS#4626 by allowing a consumer in a glued subordinate to keep its parent context up to date.

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Re: authz-regexp matches twice on same dse (ITS#4698)
by ando＠sys-net.it 06 Oct '06

06 Oct '06

> Pierangelo Masarati wrote: > >> I don't see an error in OpenLDAP software here. authz regexp matching >> is >> designed to succeed only if the identity is univoquely resolved to >> exactly one >> DN. I'm afraid but I cannot even imagine how slapd could decide to pick >> one out >> of many DNs when authenticating a user; I guess noone else can. >> >> p. >> > > Matched dn's are unique, as they describing the same Entry: > > dn: uid=works,dc=example,dc=org > objectClass: extensibleObject > uid: works > > dn: cn=worksalso,dc=example,dc=org > objectClass: extensibleObject > cn: worksalso > > dn: uid=fails,dc=example,dc=org > objectClass: extensibleObject > uid: fails > cn: fails > > "(|(cn=works)(uid=works))" and "(|(cn=worksalso)(uid=worksalso))" matching > either attribute, whereas "(|(cn=works)(uid=works))" matches twice, but > describes the same object. > > ldapsearching for "(|(cn=fails)(uid=fails))" will also return only the one > and unique entry "uid=fails,dc=example,dc=org" What authz-regexp does is run an internal search. If the search returns exactly one entry, then there's no way it can be, say, returned twice, otherwise it would also when running aregular search. Moreover, I've recrated you scenario in 2.3.27 and HEAD, and everything seems to work as expected in all cases. I suspect something else is wrong, for example data in your DB is not like it appears. Usually, guessing and expecting is a bad practice when debugging software. Please perform offending operations with full logs on; check that your data is not duplicated (for example, you might not see duplicates because they're hidden by ACLs) and so. Unless you can show a clear malfunction of the software (which I don't see here) I'm inclined towards closing this ITS. p. Ing. Pierangelo Masarati OpenLDAP Core Team SysNet s.n.c. Via Dossi, 8 - 27100 Pavia - ITALIA http://www.sys-net.it ------------------------------------------ Office: +39.02.23998309 Mobile: +39.333.4963172 Email: pierangelo.masarati(a)sys-net.it ------------------------------------------

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