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Is calculating an MD5 hash less CPU intensive than SHA family functions?
... 1024 bytes 8192 bytes
md5 30055.02k 94158.96k 219602.97k 329008.21k 384150.47k
sha1 31261.12k 95676.48k 224357.36k 332756.21k 396864.62k
Update: 10 months later with OS X 10.9, SHA-1 got slower on the same machine:
$ openssl speed md5 sha1
OpenSSL 0....
如何查看Oracle用户的SQL执行历史记录？ - 数据库(内核) - 清泛网 - 专注C/...
...启supplemental logging，默认是没有开启的。
conn / as sysdba
--安装LOGMINER
SQL> @$ORACLE_HOME/rdbms/admin/dbmslmd.sql;
SQL> @$ORACLE_HOME/rdbms/admin/dbmslm.sql;
SQL> @$ORACLE_HOME/rdbms/admin/dbmslms.sql;
SQL> @$ORACLE_HOME/rdbms/admin/prvtlm.plb;
--开启附加日志
alter ...
Position absolute but relative to parent
...
DomenicDomenic
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...
那些年 O2O创业我踩了十个坑 - 资讯 - 清泛网 - 专注C/C++及内核技术
...以用个人订阅号作为对外窗口，再加一个固定电话，甚至手机都可以；制定一个不要太低的价格表，和周边社区洗衣店的价格相持平，甚至略高于他们；洗涤也无需跑到中央工厂，直接拿到客户的衣服就到旁边的洗衣店去，哪怕...
convert '1' to '0001' in JavaScript [duplicate]
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KooiIncKooiInc
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淘宝大秒系统设计详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...验。一些数据
大家还记得2013年的小米秒杀吗？三款小米手机各11万台开卖，走的都是大秒系统，3分钟后成为双十一第一家也是最快破亿的旗舰店。经过日志统计，前端系统双11峰值有效请求约60w以上的QPS ，而后端cache的集群峰...
Addition for BigDecimal
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Vincent RamdhanieVincent Ramdhanie
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Count all occurrences of a string in lots of files with grep
..."... my that curry was strong" * >> wc :)
– icc97
Mar 23 '16 at 16:03
add a comment
...
C++ performance challenge: integer to std::string conversion
...676869"
"70717273747576777879"
"80818283848586878889"
"90919293949596979899"
};
std::string& itostr(int n, std::string& s)
{
if(n==0)
{
s="0";
return s;
}
int sign = -(n<0);
unsigned int val = (n^sign)-sign;
int size;
if(val>=10000)...
How to get ASCII value of string in C#
...an array of the ASCII value of the bytes. I got the following:
57
113
117
97
108
105
53
50
116
121
51
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