I am having trouble getting a mysql server to open more than 1020 connections.
Background:
I am in the process of upgrading from redhat 9 to rhel 3. The old server could quite
happily open up 1500 connections, but the new rhel 3 always stops at 1020 connections.
Both the rh9 and rhel 3 are using the same mysql versions and configurations.
Hardware and kernel version
The rhel 3 system
kernel 2.4.21-27.ELsmp
quad opteron 32 GB RAM.
The rh 9
Kernel 2.4.20-8bigmem
dual xeon 12 GB RAMBoth kernel are standard ones that are shipped with RedHat.
Things I have changed
/proc/sys/fs/file-max and I am no where near the limit set there.
I have also looked at the output of sysctl -a but I cant see any obvoius things I could change. The output of which is included at the bottom
I have also looked at changing the values retruned by ulimit -a
in particular the open files it was set to 1020 and is now set to 3000.
Any help here would be much appreciated.
Thanks
Aaron
vm.skip_mapped_pages = 0 vm.stack_defer_threshold = 2048 vm.inactive_clean_percent = 30 vm.dcache_priority = 0 vm.hugetlb_pool = 0 vm.max_map_count = 65536 vm.max-readahead = 31 vm.min-readahead = 3 vm.page-cluster = 3 vm.pagetable_cache = 25 50 vm.kswapd = 512 32 8 vm.pagecache = 1 15 30 vm.overcommit_ratio = 50 vm.overcommit_memory = 0 vm.bdflush = 50 500 0 0 500 3000 80 50 0 kernel.mem_nmi_panic = 0 kernel.unknown_nmi_panic = 0 kernel.sercons_esc = -1 kernel.overflowgid = 65534 kernel.overflowuid = 65534 kernel.random.uuid = 8808693b-9dc4-418e-9519-8d751a7ff333 kernel.random.boot_id = 173aabe6-fc44-4042-bae3-e8652c0db634 kernel.random.write_wakeup_threshold = 128 kernel.random.read_wakeup_threshold = 64 kernel.random.entropy_avail = 2480 kernel.random.poolsize = 512 kernel.pid_max = 32768 kernel.threads-max = 14336 kernel.cad_pid = 1 kernel.sysrq-timer = 10 kernel.sysrq-sticky = 0 kernel.sysrq-key = 84 kernel.sysrq = 0 kernel.sem = 250 32000 32 128 kernel.msgmnb = 16384 kernel.msgmni = 16 kernel.msgmax = 8192 kernel.shmmni = 4096 kernel.shmall = 2097152 kernel.shmmax = 33554432 kernel.rtsig-max = 1024 kernel.rtsig-nr = 0 kernel.acct = 4 2 30 kernel.hotplug = /sbin/hotplug kernel.modprobe = /sbin/modprobe kernel.printk = 6 4 1 7 kernel.ctrl-alt-del = 0 kernel.real-root-dev = 256 kernel.task_size = -1073741824 kernel.cap-bound = -257 kernel.tainted = 0 kernel.core_pattern = core kernel.core_setuid_ok = 0 kernel.core_uses_pid = 1 kernel.use-nx = 0 kernel.exec-shield-randomize = 1 kernel.exec-shield = 1 kernel.print_fatal_signals = 0 kernel.panic_on_oops = 1 kernel.panic = 0 kernel.domainname = (none) kernel.hostname = db4.ixe.activehotels.com kernel.version = #1 SMP Wed Dec 1 21:59:02 EST 2004 kernel.osrelease = 2.4.21-27.ELsmp kernel.ostype = Linux fs.quota.syncs = 21 fs.quota.free_dquots = 0 fs.quota.allocated_dquots = 0 fs.quota.cache_hits = 0 fs.quota.writes = 0 fs.quota.reads = 0 fs.quota.drops = 0 fs.quota.lookups = 0 fs.aio-pinned = 0 fs.aio-max-pinned = 2097152 fs.aio-max-size = 131072 fs.aio-max-nr = 65536 fs.aio-nr = 0 fs.lease-break-time = 45 fs.dir-notify-enable = 1 fs.leases-enable = 1 fs.overflowgid = 65534 fs.overflowuid = 65534 fs.dentry-state = 2323 1381 45 0 0 0 fs.file-max = 3355443 fs.file-nr = 3874 393 3355443 fs.inode-state = 8701 6688 0 0 0 0 0 fs.inode-nr = 8701 6688
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