copy algorithm, and a parallel multithreaded collector, but its focus is different from other collectors. This collector is mainly about the concept of throughput . The focus of collectors, such as CMS, is to minimize the downtime of user threads when garbage collection occurs, while the parallel collector's goal is to hit a controllable throughput . The so-called thr
Performance Test Results analysis flowchartResults SummaryLoadRunner after the scene test results are collected, a summary of the results is displayed first, as shown in 1-2. The summary lists scenario execution, Statistics Summary (Summary of Statistics), Transaction Summary (transaction Summary), and HTTP responses Summary (HTTP response summary). List the results of this test with a brief information.Figure 1-2 Performance Test Results summary diagramScenario Execution StatusThis section giv
LoadRunner after the scene test results are collected, a summary of the results is displayed first, as shown in 1-2. The summary lists scenario execution, Statistics Summary (Summary of Statistics), Transaction Summary (transaction Summary), and HTTP responses Summary (HTTP response summary). List the results of this test with a brief information.Figure 1-2 Performance Test Results summary diagramScenario Execution StatusThis section gives the name of the test scenario, the result storage
test results to a 'gnupload' or TSV (separated by tabs) file. This file can be easily imported to Gnuplot, IDL, Mathematica, Igor or even Excel. The title of the first behavior.
-I: Execute the HEAD request instead of GET.
-K enables the HTTP KeepAlive function, that is, multiple requests are executed in an HTTP session. By default, KeepAlive is not enabled.
-Q if the number of requests processed exceeds 150, each time AB processes about 10% or 100 requests, it will output a progress count i
test the linker compilation, code optimization, memory cache, Wait Status, integer data type, and so on. both hardware and software design greatly affect the test results.
Whetstone Test
This test item is used to test the efficiency and speed of floating point operations. This test project contains several typical performance modules for scientific computing, including a large number of C functions, sin cos sqrt exp and logs, and mathematical operations using integers and floating points. Conta
request rather than get.
-K enables the HTTP keepalive feature, which executes multiple requests in an HTTP session. The KeepAlive feature is not enabled by default.
-Q Output A progress count in stderr if the number of requests processed is greater than 150,ab per processing of approximately 10% or 100 requests. This-Q tag can suppress this information.
Four, AB performance index
Several metrics are important in the performance testing process:
1. Thr
aggregated reports (Aggregate report)
For each request, it counts the response information and provides the number of requests, average, maximum, minimum, error rate, approximate throughput (in Requests/sec), and throughput in kb/seconds.
The throughput is counted from the point of view of the sampled target (for example, the remote server set in the HTTP reques
alternately. Each time, the garbage collection thread collects only a small area of memory space, and then switches to the application thread. Repeat until garbage collection is complete. In this way, due to the intermittent execution of the application code during the garbage collection process, the system's pause time can be reduced. However, because of the consumption of thread switching and context conversion, the overall cost of garbage collection increases, resulting in decreased system
First, the performance Test terminology interpretation1. Response TimeResponse time is the time it takes to start a request from the application to the last byte of data received by the client. Response time according to the characteristics of the software can be subdivided, such as the response time for a C/s software can be subdivided into network transmission time, Application server processing time, database server processing time. In addition, the client itself also has parsing time, interf
system environment, it is not easy to migrate one tuning strategy intact to another system environment, often without the desired tuning purpose, and possibly by more performance bottlenecks.Back to top of pageWebSphere System Queue Introduction and tuningWas is made up of a series of interacting components that must be properly tuned to meet the requirements of the customer's application for system performance. These adjustments and tuning will help the system achieve maximum
12 out of the 18 Gigabit access switches with 2 Gigabit ports and 6 out of 1 gigabit port. Only two vswitches With gigabit copper ports are available. The most Gigabit ports are 1000Base-SX ports. Only Flexhammer24 of harbor technology has a 1000Base-LX port. Among these switches, The EDIMAXES-5224r +, Netcore 7224NSS, Netcore 7224MST, LeapComm GMS5024 three vswitches are configurable, harbor FlexHammer24, FlexHamm16i, ThinkerEX3124A switch belongs to the third layer switch. The remaining 11 vsw
important indicator of vro performance.
Device Throughput
The packet forwarding capability of the entire device, which is an important indicator of the device performance. The router selects routes based on IP headers or MPLS labels, so the performance indicator is the number of forwarding packets per second. The device throughput is generally less than the sum of the
= defined4. Run unixtasks
[Root @ Oracle unixbench-5.1.2] #./Run
Make all
Make [1]: Entering directory '/root/unixbench-5.1.2'
Checking distribution of files
./Pgms exists
./Src exists
./Testdir exists
./Tmp exists
./Results exists
Make [1]: Leaving directory '/root/unixbench-5.1.2'
Sh: 3 dinfo: command not found
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Version 5.1.2 Based on the Byte Magazine Un
Reveal the secrets of increasing QPSGuideIn actual development, many people fear that the QPS of the system increases, because they think that the system will be suspended if the QPS is too high. Based on this mentality, they will try to reduce the system's request volume as much as possible, some people may even place a lot of processing in the service for processing. In this way, when an external request is sent, the service will process all the services.
This method reduces the system's Reque
, we usually use HTTP to enable short connections to quickly process highly concurrent requests.This is the result after I change to HTTP short connection.
Transactions: 200 hitsAvailability: 100.00 %Elapsed time: 2.09 secsData transferred: 0.00 MBResponse time: 0.02 secsTransaction rate: 95.69 trans/secThroughput: 0.00 MB/secConcurrency: 1.74Successful transactions: 200Failed transactions: 0Longest transaction: 0.05Shortest tra
whether Transparent HugePage is enabled[Root @ oracle12c ~] # Uname-r3.10.0-123. el7.x86 _ 64[Root @ oracle12c ~] # Cat/sys/kernel/mm/transparent_hugepage/enabled[Always] madvise never --- this indicates that Transparent Hugepage is enabled
2. There are two ways to disable Transparent HugePage2.1 disable Transparent HugePage globally for throughput performanceFirst, back up the file/usr/lib/tuned/throughput
, code optimization, memory caching, wait states, Integer data types, and so on, and hardware and software design will greatly affect the test results.
Whetstone Test
This test project is used to test the efficiency and speed of floating-point operations. This test project contains a number of typical performance modules for scientific calculations, including a large number of C language functions, sin cos sqrt exp and logs, and mathematical operations using integers and floating-point numbers
This collection of 18 gigabit access to the switch with 2 gigabit switches have 12, with 1 gigabit ports have 6. The number of switches with Gigabit copper port is only 2, gigabit port is 1000base-sx Port, only harbor technology Flexhammer24 with a 1000BASE-LX port. These switches in edimaxes-5224r+, Netcore 7224NSS, Netcore 7224MST, Leapcomm GMS5024 three switches belong to the configurable switch, the port FlexHammer24, flexhamm16i, The thinkerex3124a switch belongs to the third tier switch. T
applications that need to perform many I/O operations, such as file servers, databases, and interactive shells, which expect smaller response times. They are limited by the I/O subsystem or network resources.
for CPU-intensive workloads , you can check and count the code for CPU operations, and for I/o-intensive workloads , you can check and count the code that performs the most I/O operations. This allows for more targeted tuning. You can also use the tools that come with your system or the ap
A few days ago, I got a shell from the station, windows2000 system. The Elevation of Privilege was successful, 3389 was not enabled, and 3389 was opened. After the server was restarted, lcx forwarded and 3389 logged on.
After entering the server, we found that only one host in the same C segment is 192.168.0.50.
So I felt strange. How can we say that the unit of this station is also small and small? How can we get one .... As a result, the server is in the DMZ zone again to communicate with t
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