From: LAWRIE SMITH (lawries@btinternet.com)
Date: Thu Apr 22 2004 - 05:21:56 EDT
Admins,
I am trying to peformance tune a 4 node V5.1b-1
cluster of 2 x ES40 (8Gb RAM, 4 x 500Mhz CPU) and 2 x
ES45 (8Gb RAM, 2 x 1Ghz CPU) running multiple
instances of Progress RDMS applications. The
sysconfigtab is listed at the end of this mail.
Any advice would be welcomed but specifically, I am
trying to find out more about the vm_bigpg parameters.
I have read the documentation but remain unsure of the
significance of these parameters and where it would be
appropriate to use them, and how to discover this.
Can anyone explain this stuff to me, or point me at a
white paper etc? I see nothing about these parameters
in the tuning manuals.
Thanks in advance (will summerise)
vm_bigpg_enabled
The master switch that enables (1) or disables
(0) memory allocation
for user processes in "big pages" mode.
Default value: 0 (disabled)
Big pages memory allocation allows a virtual
page in the process
address space to be mapped to multiple pages in
the system's physical
memory. This mapping can be to 8-pages,
64-pages, or 512-pages (64,
512, or 4096 Kbytes, respectively) of physical
memory.
Big pages uses threshold values set on a per
memory-type basis to
determine whether a memory allocation request is
eligible to use the
extended page sizes. The attributes that set
these thresholds are
vm_bigpg_anon, vm_bigpg_shm, vm_bigpg_ssm,
vm_bigpg_seg, and
vm_bigpg_stack.
If big pages memory allocation is disabled, the
kernel maps each vir-
tual page in the user address space to 8 Kbytes
of memory.
To enable big pages, you must set the
vm_bigpg_enabled attribute at
system boot time.
generic:
memberid=1
msgbuf_size=524288
new_vers_high=1445673072572143232
new_vers_low=268488508
act_vers_high=1445673072572143232
act_vers_low=268488508
rolls_ver_lookup=0
kmem_debug=0x40
kmem_protected_size=32
version_vendor = Compaq Computer Corporation
version_avendor = COMPAQ
version_product = Tru64 UNIX
version_banner = Compaq Tru64 UNIX
vm:
swapdevice=/dev/disk/dsk0f,/dev/disk/dsk3f
vm_page_free_reserved=20
vm_page_free_min=30
vm-swap-eager = 1
vm-page-free-target = 2048
vm-ubcseqstartpercent = 50
ubc_maxpercent = 70
vm_ubcdirtypercent=30
ubc_minpercent=10
vm_page_prewrite_target = 5500
vm_segmentation = 1
proc:
max_proc_per_user=6000
max_threads_per_user=4096
round_robin_switch_rate=60
autonice=1
autonice_time=300
autonice_penalty=15
per_proc_data_size=10737418240
max_per_proc_data_size=10737418240
max_per_proc_address_space=4398046511104
per_proc_address_space=4398046511104
inet:
udp_ttl=60
udp_recvspace=262144
tcp_keepalive_default=1
tcp_keepidle=3600
ipport_userreserved=65000
ipqmaxlen=2048
socket:
sominconn=65000
somaxconn=65000
pts:
nptys=512
vfs:
bufcache = 1
noadd_exec_access = 0
ipc:
shm_max=1073741824
shm_seg=512
sem_mni=2048
sem_msl=2048
shm_mni=2048
sem_opm=400
sem_ume=400
sec:
acl_mode = enable
lsm:
lsm_rootdev_is_volume=0
clubase:
cluster_expected_votes=5
cluster_name=wm-hart-cluster
cluster_node_name=CH004
cluster_node_inter_name=CH004-ics0
cluster_node_votes=1
cluster_interconnect=mct
cluster_seqdisk_major=19
cluster_seqdisk_minor=143
cluster_qdisk_major=19
cluster_qdisk_minor=383
cluster_qdisk_votes=1
advfs:
AdvfsAccessMaxPercent=35
AdvfsSyncMmapPages=0
cfs:
cfsiosize=131072
Lawrie
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