Mysteriously Slow Performance - running CentOS 6.2

Issues related to hardware problems
zebrastripe
Posts: 6
Joined: 2012/02/13 16:53:36

Mysteriously Slow Performance - running CentOS 6.2

Post by zebrastripe » 2012/02/13 17:40:50

Hello!

I have a server running CentOS 6.2. The computer has 32GB of RAM, 2 dual core xeon 3GHz processors, but it seems to run my apps REALLY slowly.

I used the DaCapo benchmark suite to do some tests. The server takes 64 seconds to run the "avrora" benchmark. (By comparison, my laptop running Ubuntu 10.04 with 2GB ram and 1 dual core xeon 2.4GHz processor runs the same test in 9 seconds.)

I've tested the hard drives, and they run quite fast. The server is also not running a GUI.

The problem is, I really don't have a good idea where to start on tracking down why this is running so slow. Does anyone have any ideas, or suggestions of avenues for me to explore? I'm wondering if I have configured something in the OS incorrectly.

Thanks so much for your time,
Andy

pschaff
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Mysteriously Slow Performance - running CentOS 6.2

Post by pschaff » 2012/02/13 18:41:46

Welcome to the CentOS fora. Please see the recommended reading for new users linked in my signature.

Not much to go on. All I can suggest is that you [url=http://www.centos.org/modules/newbb/viewtopic.php?topic_id=28723&forum=54]provide more information about your system[/url] by running "./getinfo.sh" and showing us the output file.

zebrastripe
Posts: 6
Joined: 2012/02/13 16:53:36

Re: Mysteriously Slow Performance - running CentOS 6.2

Post by zebrastripe » 2012/02/14 03:45:55

Thank you kindly for your reply.

Hopefully this time my post is a little bit improved to have enough information :) Sorry if it is not again!!! Also, sorry if I have chosen the wrong category for this post. At the beginning I assumed it was a hardware problem.

At the end is the output of get_info.sh.

To add a little bit more information(and my apologies for the vagueness here, but it seems like there is something in the following detail):

The server in question is in a remote place, however I've installed CentOS 6.2 on a local server to try and reproduce the problem. The server has a minimal install without a GUI. I ran the Java benchmark "avrora" from the "DaCapo" library "http://dacapobench.org/" The result was that it took ~1000 seconds to complete.

Next I reinstalled CentOS 6.2 with the development workstation option(on the same server), and loaded into the GUI. Now the same benchmark runs in 12 seconds, which is a perfectable great time!

So now my question is: what is different between these two installs? And how can I bring my remote server up to having whatever is missing? (I have no out-of-band access)

Thanks again!



Information for general problems.
[code]
== BEGIN uname -rmi ==
2.6.32-220.4.1.el6.x86_64 x86_64 x86_64
== END uname -rmi ==

== BEGIN rpm -qa \*-release\* ==
centos-release-6-2.el6.centos.7.x86_64
== END rpm -qa \*-release\* ==

== BEGIN cat /etc/redhat-release ==
CentOS release 6.2 (Final)
== END cat /etc/redhat-release ==

== BEGIN getenforce ==
Enforcing
== END getenforce ==

== BEGIN free -m ==
total used free shared buffers cached
Mem: 32108 1253 30854 0 87 654
-/+ buffers/cache: 510 31597
Swap: 34287 0 34287
== END free -m ==

== BEGIN rpm -qa yum\* rpm-\* python | sort ==
python-2.6.6-29.el6.x86_64
rpm-build-4.8.0-19.el6.x86_64
rpm-libs-4.8.0-19.el6.x86_64
rpm-python-4.8.0-19.el6.x86_64
yum-3.2.29-22.el6.centos.noarch
yum-metadata-parser-1.1.2-16.el6.x86_64
yum-plugin-fastestmirror-1.1.30-10.el6.noarch
yum-plugin-security-1.1.30-10.el6.noarch
yum-utils-1.1.30-10.el6.noarch
== END rpm -qa yum\* rpm-\* python | sort ==

== BEGIN ls /etc/yum.repos.d ==
CentOS-Base.repo
CentOS-Debuginfo.repo
CentOS-Media.repo
== END ls /etc/yum.repos.d ==

== BEGIN cat /etc/yum.conf ==
[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=5
bugtracker_url=http://bugs.centos.org/set_project.php?project_id=16&ref=http://bugs.centos.org/bug_report_page.php?category=yum
distroverpkg=centos-release

# This is the default, if you make this bigger yum won't see if the metadata
# is newer on the remote and so you'll "gain" the bandwidth of not having to
# download the new metadata and "pay" for it by yum not having correct
# information.
# It is esp. important, to have correct metadata, for distributions like
# Fedora which don't keep old packages around. If you don't like this checking
# interupting your command line usage, it's much better to have something
# manually check the metadata once an hour (yum-updatesd will do this).
# metadata_expire=90m

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
== END cat /etc/yum.conf ==

== BEGIN yum repolist all ==
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: centos.mirror.nac.net
* extras: mirror.trouble-free.net
* updates: mirror.ash.fastserv.com
repo id repo name status
base CentOS-6 - Base enabled: 6,294
c6-media CentOS-6 - Media disabled
centosplus CentOS-6 - Plus disabled
contrib CentOS-6 - Contrib disabled
debug CentOS-6 - Debuginfo disabled
extras CentOS-6 - Extras enabled: 4
updates CentOS-6 - Updates enabled: 338
repolist: 6,636
== END yum repolist all ==

== BEGIN egrep 'include|exclude' /etc/yum.repos.d/*.repo ==
== END egrep 'include|exclude' /etc/yum.repos.d/*.repo ==

== BEGIN sed -n -e "/^\[/h; /priority *=/{ G; s/\n/ /; s/ity=/ity = /; p }" /etc/yum.repos.d/*.repo | sort -k3n ==
== END sed -n -e "/^\[/h; /priority *=/{ G; s/\n/ /; s/ity=/ity = /; p }" /etc/yum.repos.d/*.repo | sort -k3n ==

== BEGIN cat /etc/fstab ==

#
# /etc/fstab
# Created by anaconda on Thu Jan 5 21:15:57 2012
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_trident-lv_root / ext4 defaults 1 1
UUID=97ac815c-b704-48d0-98ad-abd6cb59869e /boot ext4 defaults 1 2
/dev/mapper/vg_trident-lv_home /home ext4 defaults 1 2
/dev/mapper/vg_trident-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
== END cat /etc/fstab ==

== BEGIN df -h ==
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_trident-lv_root
50G 3.8G 43G 9% /
tmpfs 16G 0 16G 0% /dev/shm
/dev/sda1 485M 59M 401M 13% /boot
/dev/mapper/vg_trident-lv_home
52G 244M 49G 1% /home
== END df -h ==

== BEGIN fdisk -l ==
Disk /dev/mapper/vg_trident-lv_root doesn't contain a valid partition table
Disk /dev/mapper/vg_trident-lv_swap doesn't contain a valid partition table
Disk /dev/sdc doesn't contain a valid partition table
Disk /dev/mapper/vg_trident-lv_home doesn't contain a valid partition table

Disk /dev/sda: 146.2 GB, 146163105792 bytes
255 heads, 63 sectors/track, 17769 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00078c46

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 17770 142224384 8e Linux LVM

Disk /dev/mapper/vg_trident-lv_root: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vg_trident-lv_swap: 36.0 GB, 35953573888 bytes
255 heads, 63 sectors/track, 4371 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/sdc: 16 MB, 16777216 bytes
1 heads, 32 sectors/track, 1024 cylinders
Units = cylinders of 32 * 512 = 16384 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xffffffff


Disk /dev/mapper/vg_trident-lv_home: 56.0 GB, 55993958400 bytes
255 heads, 63 sectors/track, 6807 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

== END fdisk -l ==

== BEGIN blkid ==
/dev/sda1: UUID="97ac815c-b704-48d0-98ad-abd6cb59869e" TYPE="ext4"
/dev/sda2: UUID="IaGf06-hx2c-pfVK-8Hoz-sl3e-GCVT-W5Y3nT" TYPE="LVM2_member"
/dev/mapper/vg_trident-lv_root: UUID="04c6a10c-da5a-423e-a507-9b314a1daa6f" TYPE="ext4"
/dev/mapper/vg_trident-lv_swap: UUID="13468d38-50a1-44c2-8c30-79a25319977b" TYPE="swap"
/dev/mapper/vg_trident-lv_home: UUID="b135e201-b9a9-412f-a401-8faf1420c060" TYPE="ext4"
== END blkid ==

== BEGIN cat /proc/mdstat ==
Personalities :
unused devices: <none>
== END cat /proc/mdstat ==

== BEGIN pvs ==
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_trident lvm2 a-- 135.63g 0
== END pvs ==

== BEGIN vgs ==
VG #PV #LV #SN Attr VSize VFree
vg_trident 1 3 0 wz--n- 135.63g 0
== END vgs ==

== BEGIN lvs ==
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_home vg_trident -wi-ao 52.15g
lv_root vg_trident -wi-ao 50.00g
lv_swap vg_trident -wi-ao 33.48g
== END lvs ==

== BEGIN rpm -qa kernel\* | sort ==
kernel-2.6.32-220.4.1.el6.x86_64
kernel-2.6.32-220.el6.x86_64
kernel-devel-2.6.32-220.4.1.el6.x86_64
kernel-firmware-2.6.32-220.4.1.el6.noarch
kernel-headers-2.6.32-220.4.1.el6.x86_64
== END rpm -qa kernel\* | sort ==

== BEGIN lspci -nn ==
00:00.0 Host bridge [0600]: Intel Corporation 5000X Chipset Memory Controller Hub [8086:25c0] (rev 12)
00:02.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI Express x4 Port 2 [8086:25e2] (rev 12)
00:03.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI Express x4 Port 3 [8086:25e3] (rev 12)
00:04.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI Express x8 Port 4-5 [8086:25f8] (rev 12)
00:05.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI Express x4 Port 5 [8086:25e5] (rev 12)
00:06.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI Express x8 Port 6-7 [8086:25f9] (rev 12)
00:07.0 PCI bridge [0604]: Intel Corporation 5000 Series Chipset PCI Express x4 Port 7 [8086:25e7] (rev 12)
00:08.0 System peripheral [0880]: Intel Corporation 5000 Series Chipset DMA Engine [8086:1a38] (rev 12)
00:10.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset FSB Registers [8086:25f0] (rev 12)
00:10.1 Host bridge [0600]: Intel Corporation 5000 Series Chipset FSB Registers [8086:25f0] (rev 12)
00:10.2 Host bridge [0600]: Intel Corporation 5000 Series Chipset FSB Registers [8086:25f0] (rev 12)
00:11.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset Reserved Registers [8086:25f1] (rev 12)
00:13.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset Reserved Registers [8086:25f3] (rev 12)
00:15.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset FBD Registers [8086:25f5] (rev 12)
00:16.0 Host bridge [0600]: Intel Corporation 5000 Series Chipset FBD Registers [8086:25f6] (rev 12)
00:1c.0 PCI bridge [0604]: Intel Corporation 631xESB/632xESB/3100 Chipset PCI Express Root Port 1 [8086:2690] (rev 09)
00:1d.0 USB controller [0c03]: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #1 [8086:2688] (rev 09)
00:1d.1 USB controller [0c03]: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #2 [8086:2689] (rev 09)
00:1d.2 USB controller [0c03]: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #3 [8086:268a] (rev 09)
00:1d.7 USB controller [0c03]: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI USB2 Controller [8086:268c] (rev 09)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e] (rev d9)
00:1f.0 ISA bridge [0601]: Intel Corporation 631xESB/632xESB/3100 Chipset LPC Interface Controller [8086:2670] (rev 09)
00:1f.1 IDE interface [0101]: Intel Corporation 631xESB/632xESB IDE Controller [8086:269e] (rev 09)
01:00.0 PCI bridge [0604]: Intel Corporation 80333 Segment-A PCI Express-to-PCI Express Bridge [8086:0370]
01:00.2 PCI bridge [0604]: Intel Corporation 80333 Segment-B PCI Express-to-PCI Express Bridge [8086:0372]
02:0e.0 RAID bus controller [0104]: Dell PowerEdge Expandable RAID controller 5 [1028:0015]
04:00.0 PCI bridge [0604]: Broadcom EPB PCI-Express to PCI-X Bridge [1166:0103] (rev c3)
05:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet [14e4:164c] (rev 12)
06:00.0 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express Upstream Port [8086:3500] (rev 01)
06:00.3 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X Bridge [8086:350c] (rev 01)
07:00.0 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express Downstream Port E1 [8086:3510] (rev 01)
07:01.0 PCI bridge [0604]: Intel Corporation 6311ESB/6321ESB PCI Express Downstream Port E2 [8086:3514] (rev 01)
08:00.0 PCI bridge [0604]: Broadcom EPB PCI-Express to PCI-X Bridge [1166:0103] (rev c3)
09:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet [14e4:164c] (rev 12)
10:0d.0 VGA compatible controller [0300]: ATI Technologies Inc ES1000 [1002:515e] (rev 02)
== END lspci -nn ==

== BEGIN lsusb ==
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 413c:a001 Dell Computer Corp. Hub
Bus 001 Device 003: ID 04b4:6560 Cypress Semiconductor Corp. CY7C65640 USB-2.0 "TetraHub"
Bus 001 Device 004: ID 413c:0000 Dell Computer Corp. DRAC 5 Virtual Keyboard and Mouse
Bus 001 Device 005: ID 413c:0001 Dell Computer Corp. DRAC 5 Virtual Media
== END lsusb ==

== BEGIN rpm -qa kmod\* kmdl\* ==
== END rpm -qa kmod\* kmdl\* ==[/code][Moderator edit: Added [i]code[/i] tags to preserve formatting.]

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TrevorH
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Re: Mysteriously Slow Performance - running CentOS 6.2

Post by TrevorH » 2012/02/14 10:00:28

[quote]
The server in question is in a remote place, however I've installed CentOS 6.2 on a local server to try and reproduce the problem. The server has a minimal install without a GUI. I ran the Java benchmark "avrora" from the "DaCapo" library "http://dacapobench.org/" The result was that it took ~1000 seconds to complete.

Next I reinstalled CentOS 6.2 with the development workstation option(on the same server), and loaded into the GUI. Now the same benchmark runs in 12 seconds, which is a perfectable great time!
[/quote]

Since it sounds like the major difference here is the lack of or presence of the GUI, have you tried running your benchmark on the same machine where it currently runs in 12 seconds but booted in runlevel 3 (command line)? I'd suspect that your benchmark is trying to open a GUI window and timing out - probably more than once to get to 1000 seconds. If the workstation runs it in another extended time and the only difference is GUI vs CLI mode then that's the most likely explanation. At this point it becomes a benchmark configuration problem and you need to ask the DaCapo people about it.

zebrastripe
Posts: 6
Joined: 2012/02/13 16:53:36

Re: Mysteriously Slow Performance - running CentOS 6.2

Post by zebrastripe » 2012/02/14 16:22:33

Hello, and thanks for your response :)

Just to quickly follow up, I have just tried this booting to run level 3, and the new install still takes 12 seconds to complete the benchmark(runs fast).

pschaff
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Re: Mysteriously Slow Performance - running CentOS 6.2

Post by pschaff » 2012/02/14 16:23:38

[quote]
zebrastripe wrote:
...
At the end is the output of get_info.sh.
...
== BEGIN rpm -qa kmod\* kmdl\* ==
== END rpm -qa kmod\* kmdl\* ==[/quote]
It may or may not be relevant to the current discussion, but your script output omitted all the network information as well as the final [i]code[/i] tag.

zebrastripe
Posts: 6
Joined: 2012/02/13 16:53:36

Re: Mysteriously Slow Performance - running CentOS 6.2

Post by zebrastripe » 2012/02/14 16:49:52

My apologies. Here is the omitted output:

[code]

== BEGIN rpm -qa kmod\* kmdl\* ==
== END rpm -qa kmod\* kmdl\* ==

== BEGIN ifconfig -a ==
eth0 Link encap:Ethernet HWaddr 00:19:B9:F2:B2:68
inet addr:xxx.xxxx.xxxx.xxxx Bcast:xxxx.xxxx.xxxx.xxxx Mask:xxxx.xxxx.xxxx.xxxx
inet6 addr: fe80::219:b9ff:fef2:b268/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:26802 errors:0 dropped:0 overruns:0 frame:0
TX packets:7642 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:31314168 (29.8 MiB) TX bytes:1223559 (1.1 MiB)
Interrupt:16 Memory:f8000000-f8012800

eth1 Link encap:Ethernet HWaddr 00:19:B9:F2:B2:6A
inet6 addr: fe80::219:b9ff:fef2:b26a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:492 (492.0 b)
Interrupt:16 Memory:f4000000-f4012800

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:174 errors:0 dropped:0 overruns:0 frame:0
TX packets:174 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:33049 (32.2 KiB) TX bytes:33049 (32.2 KiB)

== END ifconfig -a ==

== BEGIN brctl show ==
bridge name bridge id STP enabled interfaces
== END brctl show ==

== BEGIN route -n ==
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
xxx.xxx.xxx 0.0.0.0 255.255.255.240 U 0 0 0 eth0
xxx.xxx.xxx 0.0.0.0 255.255.0.0 U 1002 0 0 eth0
0.0.0.0 xxx.xxx.xxx 0.0.0.0 UG 0 0 0 eth0
== END route -n ==

== BEGIN cat /etc/resolv.conf ==
# Generated by NetworkManager
search localdomain
nameserver xxx.xxx.xxx
nameserver xxx.xxx.xxx
== END cat /etc/resolv.conf ==

== BEGIN grep net /etc/nsswitch.conf ==
#networks: nisplus [NOTFOUND=return] files
#netmasks: nisplus [NOTFOUND=return] files
netmasks: files
networks: files
netgroup: nisplus
== END grep net /etc/nsswitch.conf ==

== BEGIN chkconfig --list | grep -Ei 'network|wpa' ==
NetworkManager 0:off 1:off 2:on 3:on 4:on 5:on 6:off
matahari-network 0:off 1:off 2:off 3:off 4:off 5:off 6:off
network 0:off 1:off 2:on 3:on 4:on 5:on 6:off
wpa_supplicant 0:off 1:off 2:off 3:off 4:off 5:off 6:off
== END chkconfig --list | grep -Ei 'network|wpa' ==


[/code]

zebrastripe
Posts: 6
Joined: 2012/02/13 16:53:36

Re: Mysteriously Slow Performance - running CentOS 6.2

Post by zebrastripe » 2012/02/14 18:43:07

Adding a little more information:

I ran many more tests using the Phoronix testing suite: http://www.phoronix.com/scan.php?page=home

http://www.phoronix.com/scan.php?page=home

The server runs as expected(fast). The benchmarks test various hardware things like CPU/RAM/DISK. Please note that these benchmarks are not in Java.

However, every DaCapo benchmark I have run, as well as a few of my apps(which are all in Java) run anywhere between ~1/5-1/60 as fast as they should.

I have tried a few different JREs, so I don't think that is the problem.

Does anyone know of a place that documents the configuration differences between different types of CentOS installs?

Thanks again for your time!

pschaff
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Re: Mysteriously Slow Performance - running CentOS 6.2

Post by pschaff » 2012/02/14 18:51:41

[quote]
zebrastripe wrote:
...
Does anyone know of a place that documents the configuration differences between different types of CentOS installs?[/quote]
The [url=http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/]upstream docs[/url] plus the CentOS [url=http://wiki.centos.org/Manuals/ReleaseNotes/]Release Notes[/url] - but I doubt there is any simple and direct answer to what you seem to be looking for.

zebrastripe
Posts: 6
Joined: 2012/02/13 16:53:36

Re: Mysteriously Slow Performance - running CentOS 6.2

Post by zebrastripe » 2012/02/16 04:57:53

Thanks for the release notes link. I went through them but couldn't find a section that describes what configuration and packages goes into the different install types. Although there was a lot of good info there.

Have been continuing to delve into this issue. Wanted to add one more interesting tidbit. I attached an strace to one of the benchmarks, and it appears that something called futex is taking up 99.06% of the time, and the average time per call is over 10 times slower(891 microseconds vs 74 microseconds) on the minimal install compared to the full install.

Not sure if this is relevant, but figured it was worth a shot.

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