base698/HTTP.java

## HTTP.java
import java.net.URL;
import java.net.URLConnection;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.StringBuffer;

public class HTTP {

    public static void get() throws Exception {
      String urlString = "http://localhost:1234/";
      for(int i = 0; i < 2000; i++) {
        URL url = new URL(urlString);
        URLConnection conn = url.openConnection();
        InputStream is = conn.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        StringBuffer sb = new StringBuffer();
        int s;
        while ((s = isr.read()) != -1)
            sb.append(s);
        System.out.println(sb.toString());
      }
    }

    public static void main(String []args) throws Exception {
        Thread.sleep(5000);
        new Thread(new Runnable() {
                public void run() {
                 try{
                    get();
                 } catch(Exception e) {}
                }
            }).start();
    }
}

## my.pull.request.out.http.stacks
Tracing off-CPU time (us) of PID 20080 by user + kernel stack for 4 secs.

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    00007f362f146cc0 CHeapObj<(MemoryType)1>::operator new(unsigned long, NativeCallStack const&)
    725000796c626d65 [unknown]
    -                java (20094)
        5

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa108d805 schedule_timeout
    ffffffffa0f57662 sk_wait_data
    ffffffffa0fc1f55 tcp_recvmsg
    ffffffffa0ff179e inet_recvmsg
    ffffffffa0f5266d sock_recvmsg
    ffffffffa0f528aa SYSC_recvfrom
    ffffffffa0f53bee sys_recvfrom
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045d8cf __recv
    00007f362f5825ee Monitor::notify()
    00007f362f5c02d9 os::PlatformEvent::unpark()
    00007f362f5bca2b os::start_thread(Thread*)
    00007f36191085bc Lsun/net/spi/DefaultProxySelector$3;::run
    00007f36190004e7 call_stub
    00007f362f366435 JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*)
    00007f360befc8c0 [unknown]
    00007f36280df800 [unknown]
    00007f3612b0a1d8 [unknown]
    00007f362f1d9f70 Metadata::is_klass() const volatile
    9090909090c3c9e5 [unknown]
    -                java (20105)
        2001472

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f769580 VMThread::loop()
    00007f362f769ad0 VMThread::run()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20090)
        3000259

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f58395e Monitor::IWait(Thread*, long)
    00007f362f583f26 Monitor::wait(bool, long, bool)
    00007f362f70a791 WatcherThread::sleep() const
    00007f362f70ac2e WatcherThread::run()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20099)
        3906272

## out.http.stacks
Tracing off-CPU time (us) of PID 20080 by user + kernel stack for 10 secs.

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    00007f362f769e4e VMThread::execute(VM_Operation*)
    00007f363045a366 pthread_cond_wait
    c86d8b4c00000000 [unknown]
    -                java (20789)
        48

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    0000000000000001 [unknown]
    -                java (20105)
        55

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa080326c exit_to_usermode_loop
    ffffffffa0803abf prepare_exit_to_usermode
    ffffffffa108f825 retint_user
    00007f362ef057a0 [unknown]
    00007f362f19c4ce CompressedWriteStream::CompressedWriteStream(int)
    00007f362f5b601c OopMap::OopMap(OopMap::DeepCopyToken, OopMap*)
    00007f362f5b62e4 OopMap::deep_copy()
    00007f362f05eace CodeEmitInfo::record_debug_info(DebugInformationRecorder*, int)
    00007f362f06ddb8 LIR_Assembler::add_call_info(int, CodeEmitInfo*)
    00007f362f03acaf ImplicitNullCheckStub::emit_code(LIR_Assembler*)
    00007f362f06e4e3 LIR_Assembler::emit_slow_case_stubs()
    00007f362f03e31c Compilation::emit_code_epilog(LIR_Assembler*)
    00007f362f03ef8b Compilation::emit_code_body()
    00007f362f03f603 Compilation::compile_java_method()
    00007f362f03f69e Compilation::compile_method()
    00007f362f03fa0e Compilation::Compilation(AbstractCompiler*, ciEnv*, ciMethod*, int, BufferBlob*)
    00007f362f0407b9 Compiler::compile_method(ciEnv*, ciMethod*, int)
    00007f362f18f4c6 CompileBroker::invoke_compiler_on_method(CompileTask*)
    00007f362f190b86 CompileBroker::compiler_thread_loop()
    00007f362f70df03 JavaThread::thread_main_inner()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20097)
        56

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    00007f362f5825ee Monitor::notify()
    00007f362f5c02d9 os::PlatformEvent::unpark()
    00007f362f5bca2b os::start_thread(Thread*)
    00007f362f3c95d3 JVM_StartThread
    00007f3619017c80 Interpreter
    -                java (20804)
        74

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    00007f362f769e4e VMThread::execute(VM_Operation*)
    00007f363045a366 pthread_cond_wait
    c86d8b4c00000000 [unknown]
    -                java (20804)
        83

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    00007f36190004e7 call_stub
    00007f362f3662b6 JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*)
    00007f362f3667c1 JavaCalls::call_virtual(JavaValue*, KlassHandle, Symbol*, Symbol*, JavaCallArguments*, Thread*)
    00007f362f366c67 JavaCalls::call_virtual(JavaValue*, Handle, KlassHandle, Symbol*, Symbol*, Thread*)
    00007f362f3cb370 thread_entry(JavaThread*, Thread*)
    00007f362f70df03 JavaThread::thread_main_inner()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20789)
        98

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    00007f36190004e7 call_stub
    00007f362f3662b6 JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*)
    00007f362f3667c1 JavaCalls::call_virtual(JavaValue*, KlassHandle, Symbol*, Symbol*, JavaCallArguments*, Thread*)
    00007f362f366c67 JavaCalls::call_virtual(JavaValue*, Handle, KlassHandle, Symbol*, Symbol*, Thread*)
    00007f362f3cb370 thread_entry(JavaThread*, Thread*)
    00007f362f70df03 JavaThread::thread_main_inner()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20804)
        120

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362efe356e Assembler::movq(RegisterImpl*, Address)
    00007f36190f094c C1 temporary CodeBuffer
    00000000000000a0 [unknown]
    00007f35b403838e [unknown]
    -                java (20097)
        2001242

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f583f26 Monitor::wait(bool, long, bool)
    00007f362f70a791 WatcherThread::sleep() const
    00007f362f70ac2e WatcherThread::run()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20099)
        3255014

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa108d805 schedule_timeout
    ffffffffa0f57662 sk_wait_data
    ffffffffa0fc1f55 tcp_recvmsg
    ffffffffa0ff179e inet_recvmsg
    ffffffffa0f5266d sock_recvmsg
    ffffffffa0f528aa SYSC_recvfrom
    ffffffffa0f53bee sys_recvfrom
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045d8cf __recv
    00007f35a0017000 [unknown]
    -                java (20105)
        4002890

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa108d805 schedule_timeout
    ffffffffa0f57662 sk_wait_data
    ffffffffa0fc1f55 tcp_recvmsg
    ffffffffa0ff179e inet_recvmsg
    ffffffffa0f5266d sock_recvmsg
    ffffffffa0f528aa SYSC_recvfrom
    ffffffffa0f53bee sys_recvfrom
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045d8cf __recv
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
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    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    00007f3612abfd0b [unknown]
    -                java (20105)
        4002907

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f36190004e7 call_stub
    00007f362f3662b6 JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*)
    00007f362f3667c1 JavaCalls::call_virtual(JavaValue*, KlassHandle, Symbol*, Symbol*, JavaCallArguments*, Thread*)
    00007f362f366c67 JavaCalls::call_virtual(JavaValue*, Handle, KlassHandle, Symbol*, Symbol*, Thread*)
    00007f362f3cb370 thread_entry(JavaThread*, Thread*)
    00007f362f70df03 JavaThread::thread_main_inner()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20804)
        5000078

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    -                java (20097)
        5000078

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f36280cdfb0 [unknown]
    -                java (20099)
        6710550

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f19054b CompileQueue::get()
    00007f362f19073b CompileBroker::compiler_thread_loop()
    00007f362f70df03 JavaThread::thread_main_inner()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20095)
        7001835

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    -                java (20094)
        7001847

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f19054b CompileQueue::get()
    00007f362f19073b CompileBroker::compiler_thread_loop()
    00007f362f70df03 JavaThread::thread_main_inner()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20096)
        7001872

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f769580 VMThread::loop()
    00007f362f769ad0 VMThread::run()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20090)
        9010205
	import java.net.URL;
	import java.net.URLConnection;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import java.lang.StringBuffer;

	public class HTTP {

	public static void get() throws Exception {
	String urlString = "http://localhost:1234/";
	for(int i = 0; i < 2000; i++) {
	URL url = new URL(urlString);
	URLConnection conn = url.openConnection();
	InputStream is = conn.getInputStream();
	InputStreamReader isr = new InputStreamReader(is);
	StringBuffer sb = new StringBuffer();
	int s;
	while ((s = isr.read()) != -1)
	sb.append(s);
	System.out.println(sb.toString());
	}
	}

	public static void main(String []args) throws Exception {
	Thread.sleep(5000);
	new Thread(new Runnable() {
	public void run() {
	try{
	get();
	} catch(Exception e) {}
	}
	}).start();
	}
	}
	Tracing off-CPU time (us) of PID 20080 by user + kernel stack for 4 secs.

	ffffffffa08ac461 finish_task_switch
	ffffffffa108a0a6 schedule
	ffffffffa0908fd4 futex_wait_queue_me
	ffffffffa0909c36 futex_wait
	ffffffffa090bb27 do_futex
	ffffffffa090c4b1 sys_futex
	ffffffffa108ee7b entry_SYSCALL_64_fastpath
	00007f363045a3b0 pthread_cond_wait
	00007f362f146cc0 CHeapObj<(MemoryType)1>::operator new(unsigned long, NativeCallStack const&)
	725000796c626d65 [unknown]
	- java (20094)
	5

	ffffffffa08ac461 finish_task_switch
	ffffffffa108a0a6 schedule
	ffffffffa108d805 schedule_timeout
	ffffffffa0f57662 sk_wait_data
	ffffffffa0fc1f55 tcp_recvmsg
	ffffffffa0ff179e inet_recvmsg
	ffffffffa0f5266d sock_recvmsg
	ffffffffa0f528aa SYSC_recvfrom
	ffffffffa0f53bee sys_recvfrom
	ffffffffa108ee7b entry_SYSCALL_64_fastpath
	00007f363045d8cf __recv
	00007f362f5825ee Monitor::notify()
	00007f362f5c02d9 os::PlatformEvent::unpark()
	00007f362f5bca2b os::start_thread(Thread*)
	00007f36191085bc Lsun/net/spi/DefaultProxySelector$3;::run
	00007f36190004e7 call_stub
	00007f362f366435 JavaCalls::call_helper(JavaValue, methodHandle, JavaCallArguments, Thread)
	00007f360befc8c0 [unknown]
	00007f36280df800 [unknown]
	00007f3612b0a1d8 [unknown]
	00007f362f1d9f70 Metadata::is_klass() const volatile
	9090909090c3c9e5 [unknown]
	- java (20105)
	2001472

	ffffffffa08ac461 finish_task_switch
	ffffffffa108a0a6 schedule
	ffffffffa0908fd4 futex_wait_queue_me
	ffffffffa0909c36 futex_wait
	ffffffffa090bb27 do_futex
	ffffffffa090c4b1 sys_futex
	ffffffffa108ee7b entry_SYSCALL_64_fastpath
	00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
	00007f362f769580 VMThread::loop()
	00007f362f769ad0 VMThread::run()
	00007f362f5c7128 java_start(Thread*)
	00007f363045470a start_thread
	- java (20090)
	3000259

	ffffffffa08ac461 finish_task_switch
	ffffffffa108a0a6 schedule
	ffffffffa0908fd4 futex_wait_queue_me
	ffffffffa0909c36 futex_wait
	ffffffffa090bb27 do_futex
	ffffffffa090c4b1 sys_futex
	ffffffffa108ee7b entry_SYSCALL_64_fastpath
	00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
	00007f362f58395e Monitor::IWait(Thread*, long)
	00007f362f583f26 Monitor::wait(bool, long, bool)
	00007f362f70a791 WatcherThread::sleep() const
	00007f362f70ac2e WatcherThread::run()
	00007f362f5c7128 java_start(Thread*)
	00007f363045470a start_thread
	- java (20099)
	3906272