CN104536902A - Performance optimization method for IO (Input/Output) subsystem by testing server - Google Patents

Abstract

The invention discloses a performance optimization method for an IO (Input/Output) subsystem by a testing server, relating to the server IO subsystem. The method comprises the steps of arranging an SAS (Serial Attached SCSI) disc and a data disc on the testing server, and customizing read-write scheduling mode using a script according to the application diversity; through arranging an operation system on the testing server, after the system is normally logged, writing the optimization strategy and storing the optimization strategy; and finally, running the optimization strategy before testing. The method can effectively improve the performance of the continuous read-write mode of the magnetic disk and can improve the utilization rate of the hardware.

Description

A Performance Tuning Method for Testing Server IO Subsystem

technical field

The invention relates to a server IO subsystem, in particular to a performance tuning method for testing the server IO subsystem.

Background technique

With the rapid development of the Internet, a large number of streaming media applications, representative Youku, Tudou, etc. provide video services for Internet users. Correspondingly, the server is required to have extremely high read and write throughput performance. Customers will conduct performance tests and comparisons when selecting equipment, and products with high performance will take advantage.

Usually, the Linux operating system does not judge the user's IO operation by default, and arranges it in the same way. When the pressure on the server gradually increases, the performance of the server's IO performance gradually declines. The IO latency increases, slowing down the progress of the overall application. When reading and writing sequentially, the IO operation has a certain degree of predictability. When a certain read and write operation is completed, the system will pre-read the data in the continuous position of the disk. If there is a hit, the read and write efficiency will be improved.

The IO operation under the operating system Linux has a default scheduling algorithm, and different applications generate different types of IO operations. The IO test tool represented by the read-write test tool Iozone generates IO operations according to the test process during the test. The same process may generate the same asynchronous read-write mode. At this time, the IO scheduling test value with test read-write operations will have promote.

Contents of the invention

The purpose of the present invention is to provide a performance tuning method for the IO subsystem of the read-write test tool Iozone test server, through which the manufacturer and the user are guided to tune the existing equipment to maximize the IO of the equipment.

A kind of performance tuning method of test server IO subsystem described in the present invention, the technical scheme that solves the above-mentioned technical problem adopts is as follows: this method is the performance tuning method for Iozone test server IO subsystem of reading and writing test tool, needs a The server is used as a test server, and the test server is equipped with SAS disks and data disks, and scripts are used to customize the read and write scheduling methods according to the diversity of its own applications; by installing the operating system on the test server and logging in to the system normally, write the tuning strategy, And save the tuning strategy; finally, run the tuning strategy before testing.

Preferably, the test server adopts a rack server, and is equipped with 2 SAS disks, and is configured as raid1 to install the operating system, and is configured with 12 data disks, and is configured as raid0 to install the operating system.

Preferably, the operating system CentOS6.4 is installed on the test server, and it is installed normally by default.

Preferably, the test server adopts NF5270M3, and the matching SAS disks are two 300G 2.5-inch SAS disks, and the matching data disks are twelve 2T 3.5-inch disks.

Compared with the prior art, the performance tuning method of a test server IO subsystem of the present invention has the following beneficial effects: the method uses test equipment, rewrites the tuning strategy, and realizes the selection and setting of algorithms and parameters through scripts , which can effectively improve the performance of disk continuous reading and writing, and improve the utilization rate of hardware; through this method, the disk performance of existing servers can be improved to a certain extent under the Iozone test, which has guiding significance for hardware manufacturers and end users .

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the performance tuning method of the IO subsystem of the test server described in the present invention will be further described in detail below in conjunction with specific embodiments.

The performance tuning method of a test server IO subsystem described in the present invention is aimed at the performance tuning method of the read-write test tool Iozone test server IO subsystem, and uses scripts to customize the read-write scheduling method according to its own application diversity, and has Flexibility, practicality and operability.

The performance tuning method described in the present invention needs a server as a test server, and a SAS disk and a data disk are matched on the test server; then an operating system is installed on the test server, and after a normal login to the system, an optimization strategy is written and saved. The tuning strategy described above; finally, before testing, the tuning strategy is run.

Example:

A performance tuning method for the test server IO subsystem described in this embodiment uses a rack-mounted server as the test server, and is equipped with 2 SAS disks, and is configured as raid1 to install the operating system, and is equipped with 12 data disks at the same time. The raid0 installs the operating system; the performance tuning method described in this embodiment installs the operating system CentOS6.4 on the test server, and it is installed normally by default.

The performance tuning method of the test server IO subsystem described in this embodiment, its specific implementation process is: after the test server logs in to the system normally, write the tuning strategy:

for i in {b..m}

do

echo anticipatory >/sys/block/sd$i/queue/scheduler

echo 15000 >/sys/block/sd$i/queue/iosched/read_expire

echo 30000 >/sys/block/sd$i/queue/iosched/write_expire

echo 4096 >/sys/block/sd$i/queue/nr_requests

echo 5 >/sys/block/sd$i/device/queue_depth

blockdev --setra 512 /dev/sd$i

done

And save the above tuning strategy.

The above-mentioned tuning strategy of the method described in this embodiment is explained in detail below:

1) Lines 1-2: Do the following operations on sdb-sdm12 disks (the default test environment is 12 data disks);

2) Line 3: The default system IO policy is cfq (completely fair queue), and for streaming media applications, the probability of continuous reading and writing is high, changing to anticipatory (predictive strategy) will pre-read continuous sectors, Increase reading and writing efficiency;

3) Lines 4-5: read and write time slice timeout setting, generally read/write=1/2 appear together, a large setting value can effectively prevent read and write timeout;

4) Lines 6-8: Modify the request merge value and queue depth value according to the corresponding value;

5) Line 9: end.

Through the performance tuning method of the test server IO subsystem described in this embodiment, the above tuning strategy is run before the test. The following is the effect verification of this method, through the comparison of three Iozone test values before and after changing the strategy (in KB/s):

Before change:

Initial write " 1812105.56 "

Read " 1554452.91 "

Initial write " 1816866.94 "

Read " 1544720.16 "

Initial write " 1813688.34 "

Read " 1537983.47

After the change:

Initial write " 1887822.60 "

Read " 1595224.81 "

Initial write " 1893080.30"

Read " 1594529.09 "

Initial write " 1882738.75 "

Read "1591268.60"

Comparing the above test results, after the adjustment, the highest increase in writing strategy: 4.47%; the highest increase in reading: 3.72%, and the value is relatively stable. The above tuning values are all for streaming media testing. After many modifications and repeated tests, if you change the test model, you can make corresponding modifications, and you can also increase the read and write values.

In addition to the performance tuning method of the test server IO subsystem described in this embodiment and the test equipment used, the method of the present invention can also use test equipment: the test server is NF5270M3 (Inspur 2-way rack server), with The SAS disks are two 300G 2.5-inch SAS disks, and the matching data disks are twelve 2T 3.5-inch large disks.

In summary, the present invention provides a performance tuning method for the IO subsystem of the read-write test tool Iozone test server. The selection and setting of algorithms and parameters can be realized through scripts, which can effectively improve the performance of continuous disk read-write and other methods. performance and improve hardware utilization.

The above-mentioned specific embodiments are only specific cases of the present invention, and the scope of patent protection of the present invention includes but is not limited to the above-mentioned specific embodiments, any claims that meet the claims of the present invention and any ordinary skilled person in the technical field. Appropriate changes or substitutions should fall within the scope of patent protection of the present invention.

Claims (4)

1. the Performance tuning method of a testing server IO subsystem, it is characterized in that, for the Performance tuning method of readwrite tests instrument Iozone testing server IO subsystem, need a station server as testing server, and arrange in pairs or groups on testing server SAS dish and data disks, use the self-defined read-write scheduling mode of script according to self application diversity; By installing operating system on testing server, after normal login system, write tuning strategy, and preserve described tuning strategy; Before test, run described tuning strategy finally.

2. the Performance tuning method of a kind of testing server IO subsystem according to claim 1, is characterized in that, described testing server adopts rack-mount server, and 2 pieces of SAS dishes of arranging in pairs or groups, and do raid1 dress operating system, 12 blocks of data dishes of simultaneously arranging in pairs or groups, be all raid0 and fill operating system.

3. the Performance tuning method of a kind of testing server IO subsystem according to claim 2, is characterized in that, installing operating system CentOS6.4 on testing server, and gives tacit consent to normal mounting.

4. the Performance tuning method of a kind of testing server IO subsystem according to claim 3, is characterized in that, described testing server adopts NF5270M3, and the SAS dish of collocation is 2 pieces of 300G, 2.5 cun of SAS dishes, and the data disks of collocation is 12 pieces of 2T 3.5 cun dishes.