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LR性能指标解释 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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4.JMap。监控java程序是否有内存泄漏，需要配合eclipse插件或者MemoryAnalyzer来使用。
5.JProfiler。全面监控每个节点的CPU使用率、内存使用率、响应时间累计值、线程执行情况等，需要在JVM参数中进行配置。
6.Nmon。全面监控linux...
Test if object implements interface
... +1 The second one is better because you will probably end up needing to cast afterward with the first one thus giving you two casts ("is" and then an explicit cast). With the second approach you only cast once.
– Andrew Hare
Jan 4 '09 at 6:02
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Convert a String In C++ To Upper Case
...like 30x worse than calling glibc's toupper in a loop.) There's a dynamic_cast of the locale that doesn't get hoisted out of the per-char loop. See my answer. On the plus side, this may be properly UTF-8 aware, but the slowdown doesn't come from handling UTF-8; it comes from using a dynamic_cast ...
SHA-1 fingerprint of keystore certificate
...he method of getting the a fingerprint? Previously, I was running this command:
35 Answers
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How do I get the size of a java.sql.ResultSet?
...Query("select count(*)as RECORDCOUNT,"
+ "cast(null as boolean)as MYBOOL,"
+ "cast(null as int)as MYINT,"
+ "cast(null as char(1))as MYCHAR,"
+ "cast(null as smallint)a...
Read data from SqlDataReader
... col1Value = rdr[0].ToString();
These are objects, so you need to either cast them or .ToString().
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Convert a string to int using sql query
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You could use CAST or CONVERT:
SELECT CAST(MyVarcharCol AS INT) FROM Table
SELECT CONVERT(INT, MyVarcharCol) FROM Table
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improv...
Getting activity from context in android
... in the layout, but you will know it is actually your Activity and you can cast it so that you have what you need:
Activity activity = (Activity) context;
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How to multiply duration by integer?
...stic type system (lack of operator overloading in this case) - you have to cast the multiplication to Duration * Duration = Duration, instead of the original one which actually makes more sense: Duration * int = Duration.
– Timmmm
Jan 5 '16 at 14:49
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What does void* mean and how to use it?
.... A void * can be converted to any other pointer type without an explicit cast. You cannot dereference a void * or do pointer arithmetic with it; you must convert it to a pointer to a complete data type first.
void * is often used in places where you need to be able to work with different pointer...