英文:
when transfer object to json, with gson api "toJson", sometimes the time cost is much longer than usual
问题
使用gson在我的程序中将对象转换为json，一切正常。但当我进行性能测试时，我发现有时候调用"toJson(Object)"的耗时比平时要长得多。例如，通常情况下，转换所需时间不到1毫秒。当我调用此方法1000次时，有几次转换需要3或5毫秒，甚至超过10毫秒。在这段时间内，我检查了Tomcat的GC日志，没有发生minor gc或full gc。\n\n将程序简化为以下格式：\n\nfor(i=0;i<1000;i++){\n...\nmethod1();\nmethod2();\n... \nlong stamp1 =System.currentTimeMillis(); \nstring msg = gson.toJson(object); \nlong stamp2 =System.currentTimeMillis(); \nsystem.out.println(stamp2-stamp1); \nlog.info(msg);\n...\n}\n
英文:
I use gson in my program to transfer object to json, everything works. But when I do the performance test, I found that sometimes "toJson(Object)" cost much longer than usual. For example, usually, the transfer takes less than 1ms. When I invoke this method for 1000 times, there are several times the transfer takes 3 or 5ms, or even more than 10ms. During this period, I checked the tomcat GC log, no minor gc or full gc happened.
simplify the program into the following format:
for(i=0;i<1000;i++){
...
method1();
method2();
...
long stamp1 =System.currentTimeMillis();
string msg = gson.toJson(object);
long stamp2 =System.currentTimeMillis();
system.out.println(stamp2-stamp1);
log.info(msg);
...
}
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