From: "Alex Bennée" <alex.bennee@gmail.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1836558] Re: Qemu-ppc Memory leak creating threads
Date: Mon, 15 Jul 2019 16:21:17 -0000 [thread overview]
Message-ID: <156320767732.15826.12052270069764574125.malone@soybean.canonical.com> (raw)
In-Reply-To: 156318593102.28533.3075291509963886255.malonedeb@chaenomeles.canonical.com
Could you try an experiment and put a final 30 second sleep before the
program exits. I suspect the RCU cleanup of the per-thread data never
gets a chance to cleanup.
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https://bugs.launchpad.net/bugs/1836558
Title:
Qemu-ppc Memory leak creating threads
Status in QEMU:
Confirmed
Bug description:
When creating c++ threads (with c++ std::thread), the resulting binary
has memory leaks when running with qemu-ppc.
Eg the following c++ program, when compiled with gcc, consumes more
and more memory while running at qemu-ppc. (does not have memory leaks
when compiling for Intel, when running same binary on real powerpc CPU
hardware also no memory leaks).
(Note I used function getCurrentRSS to show available memory, see
https://stackoverflow.com/questions/669438/how-to-get-memory-usage-at-
runtime-using-c; calls commented out here)
Compiler: powerpc-linux-gnu-g++ (Debian 8.3.0-2) 8.3.0 (but same problem with older g++ compilers even 4.9)
Os: Debian 10.0 ( Buster) (but same problem seen on Debian 9/stetch)
qemu: qemu-ppc version 3.1.50
---
#include <iostream>
#include <thread>
#include <chrono>
using namespace std::chrono_literals;
// Create/run and join a 100 threads.
void Fun100()
{
// auto b4 = getCurrentRSS();
// std::cout << getCurrentRSS() << std::endl;
for(int n = 0; n < 100; n++)
{
std::thread t([]
{
std::this_thread::sleep_for( 10ms );
});
// std::cout << n << ' ' << getCurrentRSS() << std::endl;
t.join();
}
std::this_thread::sleep_for( 500ms ); // to give OS some time to wipe memory...
// auto after = getCurrentRSS();
std::cout << b4 << ' ' << after << std::endl;
}
int main(int, char **)
{
Fun100();
Fun100(); // memory used keeps increasing
}
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next prev parent reply other threads:[~2019-07-15 16:31 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-15 10:18 [Qemu-devel] [Bug 1836558] [NEW] Qemu-ppc Memory leak creating threads Daan Scherft
2019-07-15 13:34 ` [Qemu-devel] [Bug 1836558] " Daan Scherft
2019-07-15 14:15 ` Alex Bennée
2019-07-15 15:10 ` Daan Scherft
2019-07-15 15:52 ` Alex Bennée
2019-07-15 16:21 ` Alex Bennée [this message]
2019-07-15 16:50 ` Alex Bennée
2019-07-16 12:13 ` [Qemu-devel] [RFC PATCH for 4.1?] target/ppc: move opcode decode tables to PowerPCCPU Alex Bennée
2019-07-16 12:13 ` [Qemu-devel] [Bug 1836558] " Alex Bennée
2019-07-16 14:50 ` [Qemu-devel] " Richard Henderson
2019-07-17 1:33 ` David Gibson
2019-07-17 9:41 ` Alex Bennée
2019-07-17 9:41 ` [Qemu-devel] [Bug 1836558] " Alex Bennée
2019-07-17 12:13 ` [Qemu-devel] " no-reply
2019-07-16 14:01 ` [Qemu-devel] [RFC PATCH for 4.1] linux-user: unparent CPU object before unref Alex Bennée
2019-07-16 14:01 ` [Qemu-devel] [Bug 1836558] " Alex Bennée
2019-07-16 14:43 ` [Qemu-devel] " Peter Maydell
2019-07-16 14:43 ` [Qemu-devel] [Bug 1836558] " Peter Maydell
2019-07-16 15:02 ` [Qemu-devel] " Alex Bennée
2019-07-16 15:02 ` [Qemu-devel] [Bug 1836558] " Alex Bennée
2019-07-16 15:17 ` [Qemu-devel] " Philippe Mathieu-Daudé
2020-01-09 13:22 ` [Bug 1836558] Re: Qemu-ppc Memory leak creating threads Thomas Huth
2020-03-10 8:48 ` Laurent Vivier
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