Hello
Today i have seen some issue with Disk I/O performance issue can any
tell me how to improve that !
# squidinfo
Connection information for squid:
Number of clients accessing cache: 0
Number of HTTP requests received: 422259
Number of ICP messages received: 0
Number of ICP messages sent: 0
Number of queued ICP replies: 0
Request failure ratio: 0.00
Average HTTP requests per minute since start: 12157.7
Average ICP messages per minute since start: 0.0
Select loop called: 4180430 times, 0.498 ms avg
Cache information for squid:
Request Hit Ratios: 5min: 19.1%, 60min: 20.1%
Byte Hit Ratios: 5min: 9.9%, 60min: 9.6%
Request Memory Hit Ratios: 5min: 19.3%, 60min: 20.8%
Request Disk Hit Ratios: 5min: 61.6%, 60min: 53.3%
Storage Swap size: 169917856 KB
Storage Mem size: 126032 KB
Mean Object Size: 49.83 KB
Requests given to unlinkd: 0
Median Service Times (seconds) 5 min 60 min:
HTTP Requests (All): 0.42149 0.39928
Cache Misses: 0.42149 0.39928
Cache Hits: 0.46965 0.52331
Near Hits: 0.94847 0.89858
Not-Modified Replies: 0.12106 0.00286
DNS Lookups: 0.00000 0.00000
ICP Queries: 0.00000 0.00000
Resource usage for squid:
UP Time: 2083.915 seconds
CPU Time: 455.501 seconds
CPU Usage: 21.86%
CPU Usage, 5 minute avg: 20.97%
CPU Usage, 60 minute avg: 21.88%
Process Data Segment Size via sbrk(): 728820 KB
Maximum Resident Size: 0 KB
Page faults with physical i/o: 9
Memory usage for squid via mallinfo():
Total space in arena: 728952 KB
Ordinary blocks: 703156 KB 15798 blks
Small blocks: 0 KB 0 blks
Holding blocks: 96620 KB 8 blks
Free Small blocks: 0 KB
Free Ordinary blocks: 25795 KB
Total in use: 799776 KB 97%
Total free: 25795 KB 3%
Total size: 825572 KB
Memory accounted for:
Total accounted: 501426 KB
memPoolAlloc calls: 76354783
memPoolFree calls: 69149858
File descriptor usage for squid:
Maximum number of file descriptors: 64000
Largest file desc currently in use: 3491
Number of file desc currently in use: 2700
Files queued for open: 25
Available number of file descriptors: 61275
Reserved number of file descriptors: 100
Store Disk files open: 254
IO loop method: epoll
Internal Data Structures:
3418559 StoreEntries
14446 StoreEntries with MemObjects
13569 Hot Object Cache Items
3410021 on-disk objects
Store Directory Statistics:
Store Entries : 3418561
Maximum Swap Size : 184320000 KB
Current Store Swap Size: 169917840 KB
Current Capacity : 92% used, 8% free
Store Directory #0 (aufs): /cache1
FS Block Size 4096 Bytes
First level subdirectories: 64
Second level subdirectories: 256
Maximum Size: 61440000 KB
Current Size: 55189460 KB
Percent Used: 89.83%
Current load metric: 1045 / 1000
Filemap bits in use: 1011127 of 2097152 (48%)
Filesystem Space in use: 71357340/76920416 KB (93%)
Filesystem Inodes in use: 2113612/4890624 (43%)
Flags:
Accepted object sizes: 0 - (unlimited) bytes
Removal policy: heap
Store Directory #1 (aufs): /cache2
FS Block Size 4096 Bytes
First level subdirectories: 128
Second level subdirectories: 256
Maximum Size: 122880000 KB
Current Size: 114728380 KB
Percent Used: 93.37%
Current load metric: 1045 / 1000
Filemap bits in use: 2399082 of 4194304 (57%)
Filesystem Space in use: 116823500/153834852 KB (76%)
Filesystem Inodes in use: 4227212/9773056 (43%)
Flags:
Accepted object sizes: 0 - (unlimited) bytes
Removal policy: heap
# iotop
Total DISK READ: 2.20 M/s | Total DISK WRITE: 157.73 K/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
1687 rt/0 squid 7.51 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1673 rt/0 squid 548.30 K/s 15.02 K/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1684 rt/0 squid 0.00 B/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1681 rt/0 squid 37.56 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1665 rt/0 squid 3.76 K/s 450.66 K/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1683 rt/0 squid 3.76 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1674 rt/0 squid 401.84 K/s 3.76 K/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1686 rt/0 squid 146.46 K/s 435.64 K/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1670 rt/0 squid 184.02 K/s 75.11 K/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1669 rt/0 squid 0.00 B/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1688 rt/0 squid 0.00 B/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1679 rt/0 squid 259.13 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1672 rt/0 squid 0.00 B/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1671 rt/0 squid 3.76 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1682 rt/0 squid 120.18 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1685 rt/0 squid 0.00 B/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1680 rt/0 squid 11.27 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
1668 rt/0 squid 60.09 K/s 0.00 B/s 0.00 % 99.99 % (squid) -D -f
/etc/squid/squid.conf
#iostat
Linux 2.6.29.6-217.2.8.fc11.x86_64 (localhost.localdomain)
09/04/2009
avg-cpu: %user %nice %system %iowait %steal %idle
4.26 0.00 20.63 38.61 0.00 36.50
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 14.22 224.17 200.88 650114 582570
sda1 0.03 1.14 0.00 3304 10
sda2 0.01 0.61 0.00 1760 0
sda3 14.15 222.13 200.88 644170 582560
sdb 15.49 630.73 97.01 1829122 281336
sdb1 15.47 630.44 97.01 1828306 281336
sdc 5.43 388.19 0.01 1125754 16
sdc1 5.41 387.91 0.01 1124938 16
sdd 95.29 2576.46 4429.77 7471802 12846464
sdd1 95.28 2576.18 4429.77 7470986 12846464
# free -m
[root@localhost ~]# free -m
total used free shared buffers
cached
Mem: 3913 2290 1623 0 461
618
-/+ buffers/cache: 1210 2703
Swap: 8128 0 8128
# mount options
/dev/sdb1 /cache1 ext4
defaults,noatime,nodiratime,commit=30 1 2
/dev/sdd1 /cache2 ext4
defaults,noatime,nodiratime,commit=30 1 2
# utlization
[root@localhost ~]# squidclient -p 3129 mgr:utilization
Cache Utilisation:
Last 5 minutes:
sample_start_time = 1252077945.295770 (Fri, 04 Sep 2009 15:25:45 GMT)
sample_end_time = 1252078245.298118 (Fri, 04 Sep 2009 15:30:45 GMT)
client_http.requests = 192.955156/sec
client_http.hits = 35.936385/sec
client_http.errors = 0.000000/sec
client_http.kbytes_in = 160.075414/sec
client_http.kbytes_out = 4297.156368/sec
client_http.all_median_svc_time = 0.378247 seconds
client_http.miss_median_svc_time = 0.358317 seconds
client_http.nm_median_svc_time = 0.232302 seconds
client_http.nh_median_svc_time = 0.806511 seconds
client_http.hit_median_svc_time = 0.649683 seconds
server.all.requests = 151.812145/sec
server.all.errors = 0.000000/sec
server.all.kbytes_in = 3876.292995/sec
server.all.kbytes_out = 146.765518/sec
server.http.requests = 151.812145/sec
server.http.errors = 0.000000/sec
server.http.kbytes_in = 3876.296328/sec
server.http.kbytes_out = 146.765518/sec
server.ftp.requests = 0.000000/sec
server.ftp.errors = 0.000000/sec
server.ftp.kbytes_in = 0.000000/sec
server.ftp.kbytes_out = 0.000000/sec
server.other.requests = 0.000000/sec
server.other.errors = 0.000000/sec
server.other.kbytes_in = 0.000000/sec
server.other.kbytes_out = 0.000000/sec
icp.pkts_sent = 0.000000/sec
icp.pkts_recv = 0.000000/sec
icp.queries_sent = 0.000000/sec
icp.replies_sent = 0.000000/sec
icp.queries_recv = 0.000000/sec
icp.replies_recv = 0.000000/sec
icp.replies_queued = 0.000000/sec
icp.query_timeouts = 0.000000/sec
icp.kbytes_sent = 0.000000/sec
icp.kbytes_recv = 0.000000/sec
icp.q_kbytes_sent = 0.000000/sec
icp.r_kbytes_sent = 0.000000/sec
icp.q_kbytes_recv = 0.000000/sec
icp.r_kbytes_recv = 0.000000/sec
icp.query_median_svc_time = 0.000000 seconds
icp.reply_median_svc_time = 0.000000 seconds
dns.median_svc_time = 0.000000 seconds
unlink.requests = 0.000000/sec
page_faults = 0.000000/sec
swap.outs = 30.246430/sec
swap.ins = 48.952950/sec
swap.files_cleaned = 0.333331/sec
aborted_requests = 5.413291/sec
cpu_time = 62.780456 seconds
wall_time = 300.002348 seconds
cpu_usage = 20.926655%
Last 15 minutes:
sample_start_time = 1252077345.259287 (Fri, 04 Sep 2009 15:15:45 GMT)
sample_end_time = 1252078245.298118 (Fri, 04 Sep 2009 15:30:45 GMT)
client_http.requests = 192.605023/sec
client_http.hits = 36.387319/sec
client_http.errors = 0.000000/sec
client_http.kbytes_in = 215.286267/sec
client_http.kbytes_out = 4463.820739/sec
client_http.all_median_svc_time = 0.399283 seconds
client_http.miss_median_svc_time = 0.399283 seconds
client_http.nm_median_svc_time = 0.134979 seconds
client_http.nh_median_svc_time = 0.898576 seconds
client_http.hit_median_svc_time = 0.495759 seconds
server.all.requests = 151.836782/sec
server.all.errors = 0.000000/sec
server.all.kbytes_in = 4026.657379/sec
server.all.kbytes_out = 202.620147/sec
server.http.requests = 151.824561/sec
server.http.errors = 0.000000/sec
server.http.kbytes_in = 4026.599603/sec
server.http.kbytes_out = 202.605703/sec
server.ftp.requests = 0.000000/sec
server.ftp.errors = 0.000000/sec
server.ftp.kbytes_in = 0.000000/sec
server.ftp.kbytes_out = 0.000000/sec
server.other.requests = 0.012222/sec
server.other.errors = 0.000000/sec
server.other.kbytes_in = 0.057775/sec
server.other.kbytes_out = 0.015555/sec
icp.pkts_sent = 0.000000/sec
icp.pkts_recv = 0.000000/sec
icp.queries_sent = 0.000000/sec
icp.replies_sent = 0.000000/sec
icp.queries_recv = 0.000000/sec
icp.replies_recv = 0.000000/sec
icp.replies_queued = 0.000000/sec
icp.query_timeouts = 0.000000/sec
icp.kbytes_sent = 0.000000/sec
icp.kbytes_recv = 0.000000/sec
icp.q_kbytes_sent = 0.000000/sec
icp.r_kbytes_sent = 0.000000/sec
icp.q_kbytes_recv = 0.000000/sec
icp.r_kbytes_recv = 0.000000/sec
icp.query_median_svc_time = 0.000000 seconds
icp.reply_median_svc_time = 0.000000 seconds
dns.median_svc_time = 0.000000 seconds
unlink.requests = 0.000000/sec
page_faults = 0.000000/sec
swap.outs = 30.466463/sec
swap.ins = 47.375734/sec
swap.files_cleaned = 0.491090/sec
aborted_requests = 5.685310/sec
cpu_time = 186.805601 seconds
wall_time = 900.038831 seconds
cpu_usage = 20.755282%
Last hour:
(no values recorded yet)
Last 8 hours:
(no values recorded yet)
Last day:
(no values recorded yet)
Last 3 days:
(no values recorded yet)
Totals since cache startup:
sample_time = 1252078245.298118 (Fri, 04 Sep 2009 15:30:45 GMT)
client_http.requests = 497585
client_http.hits = 98806
client_http.errors = 0
client_http.kbytes_in = 486898
client_http.kbytes_out = 10448627
client_http.hit_kbytes_out = 1022894
server.all.requests = 391925
server.all.errors = 0
server.all.kbytes_in = 9445666
server.all.kbytes_out = 453239
server.http.requests = 391907
server.http.errors = 0
server.http.kbytes_in = 9445583
server.http.kbytes_out = 453216
server.ftp.requests = 0
server.ftp.errors = 0
server.ftp.kbytes_in = 0
server.ftp.kbytes_out = 0
server.other.requests = 18
server.other.errors = 0
server.other.kbytes_in = 83
server.other.kbytes_out = 23
icp.pkts_sent = 0
icp.pkts_recv = 0
icp.queries_sent = 0
icp.replies_sent = 0
icp.queries_recv = 0
icp.replies_recv = 0
icp.query_timeouts = 0
icp.replies_queued = 0
icp.kbytes_sent = 0
icp.kbytes_recv = 0
icp.q_kbytes_sent = 0
icp.r_kbytes_sent = 0
icp.q_kbytes_recv = 0
icp.r_kbytes_recv = 0
unlink.requests = 0
page_faults = 9
cpu_time = 536.720405
wall_time = 7.108411
swap.outs = 73321
swap.ins = 103874
swap.files_cleaned = 1268
aborted_requests = 14161
#squid I/O
[root@localhost ~]# squidclient -p 3129 mgr:squidaio_counts
ASYNC IO Counters:
Operation # Requests
open 138875
close 138624
cancel 138624
write 1892913
read 312034
stat 0
unlink 113294
check_callback 621451
queue 262
Threads Status:
# ID # Requests
1 0x7f126111d910 97898
2 0x7f126115e910 93939
3 0x7f126119f910 101793
4 0x7f12611e0910 100535
5 0x7f1261221910 102801
6 0x7f1261262910 92777
7 0x7f12612a3910 104368
8 0x7f12612e4910 97976
9 0x7f1261325910 98596
10 0x7f1261366910 103603
11 0x7f12613a7910 112119
12 0x7f12613e8910 100345
13 0x7f1261429910 97499
14 0x7f126146a910 98678
15 0x7f12614ab910 102280
16 0x7f12614ec910 93246
17 0x7f126152d910 93879
18 0x7f126156e910 106020
19 0x7f12615af910 94895
20 0x7f12615f0910 112291
21 0x7f1261631910 110356
22 0x7f1261672910 97180
23 0x7f12616b3910 102370
24 0x7f12616f4910 100078
25 0x7f1261735910 91527
26 0x7f1261776910 88429
# squid.conf
minimum_expiry_time 3600 seconds
http_port 3129 transparent
cache_mem 128 MB
pipeline_prefetch off
shutdown_lifetime 2 seconds
coredump_dir /var/log/squid
acl squidlocal src 127.0.0.1
acl all src 0.0.0.0/0.0.0.0
acl ourusers src xxx.xxx.xxx.0/24
hierarchy_stoplist cgi-bin ?
acl nocache url_regex "/extra/nocache"
cache deny nocache
maximum_object_size 30720 MB
minimum_object_size 1 KB
maximum_object_size_in_memory 32 KB
cache_replacement_policy heap LFUDA
memory_replacement_policy heap GDSF
cache_dir aufs /cache1 60000 64 256
cache_dir aufs /cache2 120000 128 256
range_offset_limit 0 KB
cache_access_log /var/log/squid/access.log squid
cache_log /var/log/squid/cache.log
cache_store_log none
allow_underscore on
dns_timeout 1 minutes
refresh_pattern ^ftp: 1440 60% 22160
refresh_pattern ^gopher: 1440 20% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 480 50% 22160
reload-into-ims
negative_ttl 1 seconds
positive_dns_ttl 60 hours
persistent_request_timeout 30 seconds
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
acl SSL_ports port 443 563
acl Safe_ports port 1195 1107 1174 1212 1000
acl Safe_ports port 80 # http
acl Safe_ports port 82 # http
acl Safe_ports port 81 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 563 # https, snews
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
acl purge method PURGE
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
http_access allow manager localhost
http_access allow manager all
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow ourusers
http_access allow squidlocal
http_access deny all
http_reply_access allow all
cache allow all
http_access allow purge localhost
always_direct allow all
never_direct deny all
icp_access allow ourusers
icp_access deny all
cache_mgr info@
visible_hostname proxy
dns_testnames localhost
reload_into_ims on
quick_abort_min 0 KB
quick_abort_max 0 KB
log_fqdn off
half_closed_clients off
client_db off
ipcache_size 2048
ipcache_low 90
ipcache_high 95
fqdncache_size 8129
log_icp_queries off
strip_query_terms off
store_dir_select_algorithm least-load
client_persistent_connections off
server_persistent_connections on
collapsed_forwarding on
refresh_stale_hit 180 seconds
forwarded_for off
memory_pools off
via off
cache_effective_user squid
cache_effective_group squid
vary_ignore_expire on
ignore_unknown_nameservers on
uri_whitespace allow all
request_header_max_size 120 KB
update_headers off
pid_filename /var/run/squid.pid
--
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