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Re: (ITS#2610)

To: openldap-its@OpenLDAP.org
Subject: Re: (ITS#2610)
From: e.de.groot@home.nl
Date: Sat, 5 Jul 2003 19:09:56 GMT
Just a few minutes...


On Tuesday 01 July 2003 22:33, jongchoi@OpenLDAP.org wrote:
> How long did you let it run before you gather the trace ?
> - Jong
>
> ----- Original Message -----
> From: <edg72@home.nl>
> To: <openldap-its@OpenLDAP.org>
> Sent: Tuesday, July 01, 2003 4:03 PM
> Subject: (ITS#2610)
>
> > Jong,
> >
> > (sorry for this huge post)
> >
> > I've tried OpenLDAP HEAD, including Howard's patch, but I don't see any
> > improvement when running test008.  The test was executed on an Athlon
> > 1GHz with a 40GB UDMA IDE disk running under SuSE Linux 8.2, glibc 2.3.2.
> > My
>
> guess
>
> > is that the problem gets worse on slower hardware.
> >
> > Here is the output of db_stat -c on the test-db:
> >
> > *********************
> > 62      Last allocated locker ID.
> > 2147M   Current maximum unused locker ID.
> > 9       Number of lock modes.
> > 1000    Maximum number of locks possible.
> > 1000    Maximum number of lockers possible.
> > 1000    Maximum number of lock objects possible.
> > 20      Number of current locks.
> > 47      Maximum number of locks at any one time.
> > 51      Number of current lockers.
> > 61      Maximum number of lockers at any one time.
> > 17      Number of current lock objects.
> > 30      Maximum number of lock objects at any one time.
> > 105092  Total number of locks requested.
> > 104755  Total number of locks released.
> > 0       Total number of lock requests failing because DB_LOCK_NOWAIT was
>
> set.
>
> > 741     Total number of locks not immediately available due to conflicts.
> > 235     Number of deadlocks.
> > 0       Lock timeout value.
> > 0       Number of locks that have timed out.
> > 0       Transaction timeout value.
> > 0       Number of transactions that have timed out.
> > 360KB   The size of the lock region..
> > 0       The number of region locks granted after waiting.
> > 144735  The number of region locks granted without waiting.
> > *********************
> >
> > Here is the output of GDB attached to slapd while running the test:
> >
> > *********************
> > CC365526-A:/var/tmp/openldap-2.1.22 # gdb
>
> /usr/local/openldap/libexec/slapd
>
> > 29374
> > GNU gdb 5.3
> > Copyright 2002 Free Software Foundation, Inc.
> > GDB is free software, covered by the GNU General Public License, and you
>
> are
>
> > welcome to change it and/or distribute copies of it under certain
>
> conditions.
>
> > Type "show copying" to see the conditions.
> > There is absolutely no warranty for GDB.  Type "show warranty" for
>
> details.
>
> > This GDB was configured as "i586-suse-linux"...
> > Attaching to program: /usr/local/openldap/libexec/slapd, process 29374
> > Reading symbols from /lib/libresolv.so.2...done.
> > Loaded symbols for /lib/libresolv.so.2
> > Reading symbols from /lib/libdl.so.2...done.
> > Loaded symbols for /lib/libdl.so.2
> > Reading symbols from /lib/libpthread.so.0...done.
> > [New Thread 16384 (LWP 29340)]
> > [New Thread 32769 (LWP 29343)]
> > [New Thread 16386 (LWP 29344)]
> > [New Thread 32771 (LWP 29346)]
> > [New Thread 49156 (LWP 29366)]
> > [New Thread 65541 (LWP 29367)]
> > [New Thread 81926 (LWP 29368)]
> > [New Thread 98311 (LWP 29369)]
> > [New Thread 114696 (LWP 29370)]
> > [New Thread 131081 (LWP 29371)]
> > [New Thread 147466 (LWP 29372)]
> > [New Thread 163851 (LWP 29373)]
> > [New Thread 180236 (LWP 29374)]
> > [New Thread 196621 (LWP 29375)]
> > [New Thread 213006 (LWP 29376)]
> > [New Thread 229391 (LWP 29377)]
> > [New Thread 245776 (LWP 29378)]
> > [New Thread 262161 (LWP 29379)]
> > [New Thread 278546 (LWP 29380)]
> > Loaded symbols for /lib/libpthread.so.0
> > Reading symbols from /lib/libc.so.6...done.
> > Loaded symbols for /lib/libc.so.6
> > Reading symbols from /lib/ld-linux.so.2...done.
> > Loaded symbols for /lib/ld-linux.so.2
> > Reading symbols from /lib/libnss_files.so.2...done.
> > Loaded symbols for /lib/libnss_files.so.2
> > 0x40153f57 in sched_yield () from /lib/libc.so.6
> > (gdb) thread apply all bt
> >
> > Thread 19 (Thread 278546 (LWP 29380)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 18 (Thread 262161 (LWP 29379)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 17 (Thread 245776 (LWP 29378)):
> > #0  0x40153f57 in sched_yield () from /lib/libc.so.6
> > #1  0x0813c901 in __os_yield ()
> > #2  0x08105743 in __db_tas_mutex_lock ()
> > #3  0x080e68d7 in __lock_get_internal ()
> > #4  0x080e5c21 in __lock_vec ()
> > #5  0x08123a58 in __db_lget ()
> > #6  0x08109c1b in __bam_search ()
> > #7  0x0814195e in __bam_c_search ()
> > #8  0x0813ea44 in __bam_c_get ()
> > #9  0x0811c58e in __db_c_get ()
> > #10 0x08116ed8 in __db_get ()
> > #11 0x0809bcd0 in bdb_dn2id (op=0x81d73b0, txn=0x81e8608, dn=0x473ef4f8,
> > ei=0x473ef4ec) at dn2id.c:326
> > #12 0x080989a1 in bdb_cache_find_ndn (op=0x81d73b0, txn=0x81e8608,
> > ndn=0x473ef5c4, res=0x473ef5b8, locker=2147484671) at cache.c:362
> > #13 0x0808c7e0 in bdb_modrdn (op=0x81d73b0, rs=0x473ef8cc) at
> > modrdn.c:692 #14 0x08066a99 in do_modrdn (op=0x81d73b0, rs=0x473ef8cc) at
> > modrdn.c:366 #15 0x08056355 in connection_operation (ctx=0x473ef93c,
> > arg_v=0x81d73b0)
>
> at
>
> > connection.c:963
> > #16 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #17 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 16 (Thread 229391 (LWP 29377)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 15 (Thread 213006 (LWP 29376)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 14 (Thread 196621 (LWP 29375)):
> > #0  0x0813c8f0 in __os_yield ()
> > #1  0x080e68d7 in __lock_get_internal ()
> > #2  0x080e5c21 in __lock_vec ()
> > #3  0x08123a58 in __db_lget ()
> > #4  0x08109c1b in __bam_search ()
> > #5  0x0814195e in __bam_c_search ()
> > #6  0x0813ea44 in __bam_c_get ()
> > #7  0x0811c58e in __db_c_get ()
> > #8  0x08116ed8 in __db_get ()
> > #9  0x0809bcd0 in bdb_dn2id (op=0x81d8c10, txn=0x81d8e00, dn=0x464e9468,
> > ei=0x464e945c) at dn2id.c:326
> > #10 0x080989a1 in bdb_cache_find_ndn (op=0x81d8c10, txn=0x81d8e00,
> > ndn=0x81dd0fc, res=0x464e94e4, locker=2147484666) at cache.c:362
> > #11 0x0809b1cf in bdb_dn2entry (op=0x81d8c10, tid=0x81d8e00,
> > dn=0x81d8c10, e=0x464e9548, matched=1, locker=2147484666,
> > lock=0x464e95dc)
> >     at dn2entry.c:44
> > #12 0x080966d6 in bdb_add (op=0x81d8c10, rs=0x464e98cc) at add.c:144
> > #13 0x0805b0e3 in do_add (op=0x81d8c10, rs=0x464e98cc) at add.c:303
> > #14 0x08056325 in connection_operation (ctx=0x464e993c, arg_v=0x81d8c10)
>
> at
>
> > connection.c:953
> > #15 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #16 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 13 (Thread 180236 (LWP 29374)):
> > #0  0x40153f57 in sched_yield () from /lib/libc.so.6
> > #1  0x0813c901 in __os_yield ()
> > #2  0x08105743 in __db_tas_mutex_lock ()
> > #3  0x080e68d7 in __lock_get_internal ()
> > #4  0x080e5c21 in __lock_vec ()
> > #5  0x08123a58 in __db_lget ()
> > #6  0x08109c1b in __bam_search ()
> > #7  0x0814195e in __bam_c_search ()
> > #8  0x0813ea44 in __bam_c_get ()
> > #9  0x0811c58e in __db_c_get ()
> > #10 0x08116ed8 in __db_get ()
> > #11 0x0809bcd0 in bdb_dn2id (op=0x81d3778, txn=0x81e8598, dn=0x45fe74f8,
> > ei=0x45fe74ec) at dn2id.c:326
> > #12 0x080989a1 in bdb_cache_find_ndn (op=0x81d3778, txn=0x81e8598,
> > ndn=0x45fe75c4, res=0x45fe75b8, locker=2147484670) at cache.c:362
> > #13 0x0808c7e0 in bdb_modrdn (op=0x81d3778, rs=0x45fe78cc) at
> > modrdn.c:692 #14 0x08066a99 in do_modrdn (op=0x81d3778, rs=0x45fe78cc) at
> > modrdn.c:366 #15 0x08056355 in connection_operation (ctx=0x45fe793c,
> > arg_v=0x81d3778)
>
> at
>
> > connection.c:963
> > #16 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #17 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 12 (Thread 163851 (LWP 29373)):
> > #0  0x40153f57 in sched_yield () from /lib/libc.so.6
> > #1  0x0813c901 in __os_yield ()
> > #2  0x08105743 in __db_tas_mutex_lock ()
> > #3  0x080e68d7 in __lock_get_internal ()
> > #4  0x080e5c21 in __lock_vec ()
> > #5  0x08123a58 in __db_lget ()
> > #6  0x08109c1b in __bam_search ()
> > #7  0x0814195e in __bam_c_search ()
> > #8  0x0813ea44 in __bam_c_get ()
> > #9  0x0811c58e in __db_c_get ()
> > #10 0x08116ed8 in __db_get ()
> > #11 0x0809bcd0 in bdb_dn2id (op=0x81d79b0, txn=0x81e6af8, dn=0x45ae5468,
> > ei=0x45ae545c) at dn2id.c:326
> > #12 0x080989a1 in bdb_cache_find_ndn (op=0x81d79b0, txn=0x81e6af8,
> > ndn=0x81d8074, res=0x45ae54e4, locker=2147484668) at cache.c:362
> > #13 0x0809b1cf in bdb_dn2entry (op=0x81d79b0, tid=0x81e6af8,
> > dn=0x81d79b0, e=0x45ae5548, matched=1, locker=2147484668,
> > lock=0x45ae55dc)
> >     at dn2entry.c:44
> > #14 0x080966d6 in bdb_add (op=0x81d79b0, rs=0x45ae58cc) at add.c:144
> > #15 0x0805b0e3 in do_add (op=0x81d79b0, rs=0x45ae58cc) at add.c:303
> > #16 0x08056325 in connection_operation (ctx=0x45ae593c, arg_v=0x81d79b0)
>
> at
>
> > connection.c:953
> > #17 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #18 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 11 (Thread 147466 (LWP 29372)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 10 (Thread 131081 (LWP 29371)):
> > #0  0x40153f57 in sched_yield () from /lib/libc.so.6
> > #1  0x0813c901 in __os_yield ()
> > #2  0x08105743 in __db_tas_mutex_lock ()
> > #3  0x080e68d7 in __lock_get_internal ()
> > #4  0x080e5c21 in __lock_vec ()
> > #5  0x08123a58 in __db_lget ()
> > #6  0x08109c1b in __bam_search ()
> > #7  0x0814195e in __bam_c_search ()
> > #8  0x0813ea44 in __bam_c_get ()
> > #9  0x0811c58e in __db_c_get ()
> > #10 0x08116ed8 in __db_get ()
> > #11 0x0809bcd0 in bdb_dn2id (op=0x81d9838, txn=0x81e6b68, dn=0x450e1468,
> > ei=0x450e145c) at dn2id.c:326
> > #12 0x080989a1 in bdb_cache_find_ndn (op=0x81d9838, txn=0x81e6b68,
> > ndn=0x81e4bec, res=0x450e14e4, locker=2147484669) at cache.c:362
> > #13 0x0809b1cf in bdb_dn2entry (op=0x81d9838, tid=0x81e6b68,
> > dn=0x81d9838, e=0x450e1548, matched=1, locker=2147484669,
> > lock=0x450e15dc)
> >     at dn2entry.c:44
> > #14 0x080966d6 in bdb_add (op=0x81d9838, rs=0x450e18cc) at add.c:144
> > #15 0x0805b0e3 in do_add (op=0x81d9838, rs=0x450e18cc) at add.c:303
> > #16 0x08056325 in connection_operation (ctx=0x450e193c, arg_v=0x81d9838)
>
> at
>
> > connection.c:953
> > #17 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #18 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 9 (Thread 114696 (LWP 29370)):
> > #0  0x40153f57 in sched_yield () from /lib/libc.so.6
> > #1  0x0813c901 in __os_yield ()
> > #2  0x08105743 in __db_tas_mutex_lock ()
> > #3  0x080e68d7 in __lock_get_internal ()
> > #4  0x080e5c21 in __lock_vec ()
> > #5  0x08123a58 in __db_lget ()
> > #6  0x08109c1b in __bam_search ()
> > #7  0x0814195e in __bam_c_search ()
> > #8  0x0813ea44 in __bam_c_get ()
> > #9  0x0811c58e in __db_c_get ()
> > #10 0x08116ed8 in __db_get ()
> > #11 0x0809bcd0 in bdb_dn2id (op=0x81d7178, txn=0x81d86e8, dn=0x44bdf4f8,
> > ei=0x44bdf4ec) at dn2id.c:326
> > #12 0x080989a1 in bdb_cache_find_ndn (op=0x81d7178, txn=0x81d86e8,
> > ndn=0x44bdf5c4, res=0x44bdf5b8, locker=2147484667) at cache.c:362
> > #13 0x0808c7e0 in bdb_modrdn (op=0x81d7178, rs=0x44bdf8cc) at
> > modrdn.c:692 #14 0x08066a99 in do_modrdn (op=0x81d7178, rs=0x44bdf8cc) at
> > modrdn.c:366 #15 0x08056355 in connection_operation (ctx=0x44bdf93c,
> > arg_v=0x81d7178)
>
> at
>
> > connection.c:963
> > #16 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #17 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 8 (Thread 98311 (LWP 29369)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 7 (Thread 81926 (LWP 29368)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 6 (Thread 65541 (LWP 29367)):
> > #0  0x40153f57 in sched_yield () from /lib/libc.so.6
> > #1  0x0813c901 in __os_yield ()
> > #2  0x08105743 in __db_tas_mutex_lock ()
> > #3  0x080e68d7 in __lock_get_internal ()
> > #4  0x080e5c21 in __lock_vec ()
> > #5  0x08123a58 in __db_lget ()
> > #6  0x08109c1b in __bam_search ()
> > #7  0x0814195e in __bam_c_search ()
> > #8  0x0813ea44 in __bam_c_get ()
> > #9  0x0811c58e in __db_c_get ()
> > #10 0x08116ed8 in __db_get ()
> > #11 0x0809bcd0 in bdb_dn2id (op=0x81da238, txn=0x81db790, dn=0x41cd54f8,
> > ei=0x41cd54ec) at dn2id.c:326
> > #12 0x080989a1 in bdb_cache_find_ndn (op=0x81da238, txn=0x81db790,
> > ndn=0x41cd55c4, res=0x41cd55b8, locker=2147484665) at cache.c:362
> > #13 0x0808c7e0 in bdb_modrdn (op=0x81da238, rs=0x41cd58cc) at
> > modrdn.c:692 #14 0x08066a99 in do_modrdn (op=0x81da238, rs=0x41cd58cc) at
> > modrdn.c:366 #15 0x08056355 in connection_operation (ctx=0x41cd593c,
> > arg_v=0x81da238)
>
> at
>
> > connection.c:963
> > #16 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #17 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 5 (Thread 49156 (LWP 29366)):
> > #0  0x4004597f in fsync () from /lib/libpthread.so.0
> > #1  0x080efcc1 in __os_fsync ()
> > #2  0x080ec099 in __log_flush_int ()
> > #3  0x080eb656 in __log_flush_commit ()
> > #4  0x080eb344 in __log_put ()
> > #5  0x08102612 in __txn_regop_log ()
> > #6  0x081010a8 in __txn_commit ()
> > #7  0x080976c7 in bdb_add (op=0x81d75b8, rs=0x417d38cc) at add.c:496
> > #8  0x0805b0e3 in do_add (op=0x81d75b8, rs=0x417d38cc) at add.c:303
> > #9  0x08056325 in connection_operation (ctx=0x417d393c, arg_v=0x81d75b8)
>
> at
>
> > connection.c:953
> > #10 0x080ad7f1 in ldap_int_thread_pool_wrapper (xpool=0x8195998) at
> > tpool.c:463
> > #11 0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 4 (Thread 32771 (LWP 29346)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003ed80 in pthread_cond_wait@GLIBC_2.0 () from
> > /lib/libpthread.so.0 #3  0x080ad959 in ldap_int_thread_pool_wrapper
> > (xpool=0x8195998) at tpool.c:452
> > #4  0x4003fd80 in pthread_start_thread () from /lib/libpthread.so.0
> >
> > Thread 3 (Thread 16386 (LWP 29344)):
> > #0  0x40162271 in select () from /lib/libc.so.6
> > #1  0x00000000 in ?? ()
> >
> > Thread 2 (Thread 32769 (LWP 29343)):
> > #0  0x40160827 in poll () from /lib/libc.so.6
> > #1  0x4003f97e in __pthread_manager () from /lib/libpthread.so.0
> >
> > Thread 1 (Thread 16384 (LWP 29340)):
> > #0  0x400b3548 in sigsuspend () from /lib/libc.so.6
> > #1  0x40042228 in __pthread_wait_for_restart_signal () from
> > /lib/libpthread.so.0
> > #2  0x4003f5bf in pthread_join () from /lib/libpthread.so.0
> > #3  0x0805440e in slapd_daemon () at daemon.c:2006
> > #4  0x0804b3a1 in main (argc=1080884192, argv=0x40047054) at main.c:579
> > #5  0x4009f857 in __libc_start_main () from /lib/libc.so.6
> > #0  0x40153f57 in sched_yield () from /lib/libc.so.6
> > *********************
> >
> > Regards,
> >
> > Erik
> >
> > On Tuesday 01 July 2003 17:33, Jong wrote:
> > > It would help to look at the problem if you post "db_stat -c" result in
>
> the
>
> > > list.
> > > Also wondering whether the recent congestion control patch can solve
>
> this
>
> > > problem,
> > > but I suspect it because "Number of deadlocks" is zero in this case.
> > > - Jong
> > >
> > > ----------------
> > > Jong Hyuk Choi
> > > IBM Thomas J. Watson Research Center - Enterprise Linux Group
> > > P.O. Box 218, Yorktown Heights, NY 10598
> > > email: jongchoi@us.ibm.com
> > > (phone) 914-945-3979 (fax) 914-945-4425 TL: 862-3979
> > > ----- Original Message -----
> > >
> > > From: <edg72@home.nl>
> > > To: <openldap-its@OpenLDAP.org>
> > > Sent: Thursday, June 26, 2003 5:17 PM
> > > Subject: subject=(ITS#2610)
> > >
> > > > Hi,
> > > >
> > > > I've done some futher investigation on this ITS and I've found out
>
> that
>
> > > > it
> > >
> > > is
> > >
> > > > BerkeleyDB that is calling ldap_pvt_thread_yield() all the time
>
> (callback
>
> > > > registered in /servers/slapd/back-bdb/init.c). This is the cause of
>
> the
>
> > > high
> > >
> > > > CPU usage and the large amount of context switches (over 100K/sec!)
>
> I've
>
> > > > seen. I suspect there is some bdb locking problem going on. When I
> > > > run db_stat -c while performing the modify benchmark I see that
> > > > "Total
>
> number
>
> > > of
> > >
> > > > locks not immediately available due to conflicts" is steadily
>
> increasing,
>
> > > I
> > >
> > > > am not sure if that is a serious issue. The "Number of deadlocks" is
>
> zero
>
> > > and
> > >
> > > > there are no signs of BDB running out of locks/lockers/lock objects.
> > > > I've also added some extra debug statements in
> > >
> > > /servers/slapd/back-bdb/idl.c
> > >
> > > > because from slapd's debug logging I saw that executing the function
> > > > bdb_idl_delete_key() took al lot of time, sometimes more than 15
>
> seconds!
>
> > > > I'll try to continue with digging into this problem, but I am
> > > > starting
>
> to
>
> > > run
> > >
> > > > out of ideas. Any ideas would be welcome!
> > > >
> > > > Regards,
> > > >
> > > > Erik
> > > >
> > > > PS I forgot to mention that I use BerkeleyDB 4.1.25p1 NC
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