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Difference between volatile and synchronized in Java
...n memory of what has been done are visible to other threads. Because each CPU has several levels of cache between it and main memory, threads running on different CPUs or cores can see "memory" differently at any given moment in time because threads are permitted to obtain and work on private copie...
What are the file limits in Git (number and size)?
... if they are called frequently by the web front-end to GitLab/Stash/GitHub etc then they can become bottlenecks. (e.g. 'git branch --contains' seems terribly adversely affected by large numbers of branches.)
git-blame could be slow when a file is modified a lot.
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谁在争抢UGC - 资讯 - 清泛网 - 专注C/C++及内核技术
...播客识别出侵权视频，保护原创版权。
由于网络媒体的定位及其受众的广泛性，目前采用UGC模式的网站不约而同地将娱乐作为其业务的主导方向。而从媒体的本质来说，真正能与门户网站进行竞争的仍然是与民生密切相关的新...
Why is reading lines from stdin much slower in C++ than Python?
...lly timing the execution of cat, not your benchmark. The 'user' and 'sys' CPU usage displayed by time are those of cat, not your benchmarked program. Even worse, the 'real' time is also not necessarily accurate. Depending on the implementation of cat and of pipelines in your local OS, it is possib...
开源邮件传输代理软件 -- Postfix 介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...。还有一种情况时，如果postfix在处理邮件过程中遇到了问题，则该值会开始降低。
当接收到的新邮件的数量超过postfix的投递能力时，postfix会暂时停止投递deferred队列中的邮件而去处理新接收到的邮件。这是因为处理新邮件的...
python-pandas and databases like mysql
...SQLdb.connect(host='myhost',
port=3306,user='myusername', passwd='mypassword',
db='information_schema')
df_mysql = pd.read_sql('select * from VIEWS;', con=mysql_cn)
print 'loaded dataframe from MySQL. records:', len(df_mysql)
mysql_cn.close()
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How to export and import a .sql file from command line with options? [duplicate]
... check and confirm: grant all privileges on *.* to root@"%" identified by "Passwd";
ERROR 2006 (HY000) at line 866: MySQL server has gone away
mysqldump: Got errno 32 on write
# set this values big enough on destination mysql server, like: max_allowed_packet=1024*1024*20
# use compress parameter ...
What Every Programmer Should Know About Memory?
...spend the time reading the manuals about details about the actual timings, etc. But for people interested in the HW low level stuff? Maybe not useful, but at least entertaining.
– Voo
Nov 14 '11 at 18:52
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“An attempt was made to load a program with an incorrect format” even when the platforms are the sam
...been unchecked for my executable, so it was still running with the old Any CPU build. After I fixed that, Visual Studio complained that it couldn't debug the assembly, but that was fixed with a restart.
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ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...zmq_recv函数返回错误信息 ，并使用zmq_strerror函数进行错误定位
if(zmq_recv(pSock, szMsg, sizeof(szMsg), 0) < 0)
{
printf("error = %s\n", zmq_strerror(errno));
continue;
}
printf("received message : %s\n", szMsg);
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