throughput in performance testing

It is very important to improve the throughput performance of multi-core servers. Because servers are different from desktops and workstations, the channel for dealing with the outside world is the network. No matter what complicated computing operations the processor performs, the results must be returned to the request object through the NIC. In a sense, the NIC is the "throat" component of the server for

to 177mbytes/sec, from this result can be seen, multithreading on the network transmission performance is not small.2. Test UDP packet drops and delaysIperf can also be used for UDP packet throughput, packet loss rate, and latency metrics, but since the UDP protocol is a non-connection-oriented lightweight transport protocol and does not provide reliable data transfer services, the focus on UDP application

system Throughput (TPS), user concurrency, performance test concepts and formulasThe throughput of a system (load capacity) is closely related to the request for CPU consumption, external interfaces, IO, etc.The lower the CPU consumption of a single request, the more the external interface, the faster the ID response, the greater the

One > Modify handle numberUlimit–a1 "Modify the file: /etc/security/limits.conf - Span style= "color: #000000; font-size:14px;" > current session run Span style= "font-family:arial, ' Sans-serif '; color: #000000; font-size:14px;" >ulimit-a command cannot be displayed) 1. * Soft Nofile 32768 #limit the maximum number of file handles for a single process (System alert when this limit is reached)2. * Hard Nofile 65536 #limit the maximum number of file handles for a single process

In the Taobao environment, assuming that we stress test the TPS is 100, then the system's daily throughput =100*11*3600=396 million This is in the case of simple (single URL), some pages, a page has multiple request, the actual throughput of the system is also small Regardless of time-to-think (T_think), there is a relationship between the measured TPS value and the number of concurrent virtual users (u_c

This article is translated from Niraj Bhatt performance Testing-response vs. Latency vs. Throughput vs. Load vs. Scalability vs. Stress vs. Stres S vs. robustness. Original address: https://nirajrules.wordpress.com/2009/09/17/ measuring-performance-response-vs-latency-vs-throughput-vs-load-vs-scalability-vs-stress-vs-r

simple Web application. Database connection pool, the connection pool configuration is unreasonable, will also become a system bottleneck.Here, the task of optimizing the system throughput is simplified to find the system bottleneck. The simplest way is to profile,jprofiler and so on the sharp weapon, hangs to the system to go to the pressure test.However, sometimes the environment of the business system is very complex, the cost of setting up a pres

request, receives the server response, and ends the timer to calculate the elapsed and completed transactions, and at the end uses the information to estimate the score. The client uses the weighted covariance averaging method to calculate the client's score, and the test software uses this information from the client to calculate the overall TPS score on the server side using the weighted covariance averaging essentials.Generally, evaluation system perform