benchmarking

Cassandra Reading Benchmark with Spark

由 梦想的初衷 提交于 2019-12-06 10:33:01
问题 I'm doing a benchmark on Cassandra's Reading performance. In the test-setup step I created a cluster with 1 / 2 / 4 ec2-instances and data nodes. I wrote 1 table with 100 million of entries (~3 GB csv-file). Then I launch a Spark application which reads the data into a RDD using the spark-cassandra-connector. However, I thought the behavior should be the following: The more instances Cassandra (same instance amount on Spark) uses, the faster the reads! With the writes everything seems to be

How to benchmark Linux threaded programs?

由 坚强是说给别人听的谎言 提交于 2019-12-06 10:17:33
I'm trying to compare the performance of threaded programs (on Linux). Since the programs use different thread synchronization methods and different lock granularity, running the programs on a shared server or desktop would not be good, since the other tasks may interfere with the scheduling of my programs. I don't have dedicated hosts, so I thought that using qemu would be a good option. What I want to know is: Are there any alternatives for this task? I suppose that there is no way to reproduce scheduling done by guest Linux system on qemu, if I - need to? (Suppose my program goes unusually

Any ASP.Net benchmark tool? [closed]

由 丶灬走出姿态 提交于 2019-12-06 08:47:42
Closed. This question is off-topic . It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I would like to measure the performance of the .Net application, especially web application in ASP.Net when running in the server. I need to know any benchmark tool enable for me to know my source code can be optimize. As long as the benchmark tool can be helping me optimize the performance of the website. Any recommendation for getting a benchmark tool just measuring .Net? Please kindly list out commercial and

How to do good benchmarking of complex functions?

由 断了今生、忘了曾经 提交于 2019-12-06 08:32:01
问题 I am about to embark in very detailed benchmarking of a set of complex functions in C. This is "science level" detail. I'm wondering, what would be the best way to do serious benchmarking? I was thinking about running them, say, 10 times each, averaging the timing results and give the standard dev, for instance, just using <time.h> . What would you guys do to obtain good benchmarks? 回答1: Reporting an average and standard deviation gives a good description of a distribution when the

benchmarking PHP vs Pylons

由 依然范特西╮ 提交于 2019-12-06 08:27:44
I want to benchmark PHP vs Pylons. I want my comparison of both to be as even as possible, so here is what I came up with: PHP 5.1.6 with APC, using a smarty template connecting to a MySQL database Python 2.6.1, using Pylons with a mako template connecting the the same MySQL database Is there anything that I should change in that setup to make it a more fair comparison? I'm going to run it on a spare server that has almost no activity, 2G of ram and 4 cores. Any suggestions of how I should or shouldn't benchmark them? I plan on using ab to do the actual benchmarking. Related Which is faster,

Second method call takes far less time than the first

由 烈酒焚心 提交于 2019-12-06 07:06:53
I'm trying to speed up the startup for my program, and noticed I had a method that was acting a little strange. The program itself is a Lightweight Java Game Library application that reads in points from a file, and renders them. The method of note is the method that reads from the file. What's curious about the method is I call it twice during my tests, where the first call takes 2837ms to complete, and the second only takes 1704ms. The difference between the two calls are minimal. The difference is the second call reads through half the file before beginning any operations with the file,

Poor performance

由 眉间皱痕 提交于 2019-12-06 06:37:53
问题 I am doing performance tests for my master thesis and I'm getting very poor performance of Symfony2 simple application. It's simple app, one query and some math. Test results for command: ab -c10 -t60 http://sf2.cities.localhost/app.php Server Software: Apache/2.2.20 Server Hostname: sf2.cities.localhost Server Port: 80 Document Path: /app.php Document Length: 2035 bytes Concurrency Level: 10 Time taken for tests: 60.162 seconds Complete requests: 217 Failed requests: 68 (Connect: 0, Receive:

Suggestions for optimizing passing expressions as method parameters

由 一曲冷凌霜 提交于 2019-12-06 06:28:56
问题 I'm a great fan of the relatively recent trend of using lambda expressions instead of strings for indicating properties in, for instance, ORM mapping. Strongly typed >>>> Stringly typed. To be clear, this is what I'm talking about: builder.Entity<WebserviceAccount>() .HasTableName( "webservice_accounts" ) .HasPrimaryKey( _ => _.Id ) .Property( _ => _.Id ).HasColumnName( "id" ) .Property( _ => _.Username ).HasColumnName( "Username" ).HasLength( 255 ) .Property( _ => _.Password ).HasColumnName(

Is it a way to create a clever macro to automatically benchmark something in C?

由 别等时光非礼了梦想. 提交于 2019-12-06 04:41:08
I am wondering if it is possible to create a clever macro to automatically bench a "process" in C and using only C. Let's say I have a small structure like this: typedef struct pbench { char description[256]; int nbenchs; double times; } ProcessBench; And a macro (with get_time() being a function returning a double): #define BENCH(process, bench_struct, description) \ int i; \ bench_struct.description = description; \ bench_struct.nbenchs = 50; \ double start = get_time(); \ for (i = 0; i < bench_struct.nbenchs; ++i) \ process(); \ bench_struct.times = get_time() - start; If I'm not mistaken,

Is the poor performance of std::vector due to not calling realloc a logarithmic number of times?

由 喜夏-厌秋 提交于 2019-12-06 03:40:15
问题 EDIT: I added two more benchmarks, to compare the use of realloc with the C array and of reserve() with the std::vector. From the last analysis it seems that realloc influences a lot, even if called only 30 times. Checking the documentation I guess this is due to the fact that realloc can return a completely new pointer, copying the old one. To complete the scenario I also added the code and graph for allocating completely the array during the initialisation. The difference from reserve() is
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