[Libevent-users] multithreading problem
Hello,
I'm trying to write a simple https server which utilizes multiple cpu cores.
I call evthread_use_pthreads() and create several pthreads. My
acceptcb and the thread worker functions are below.
For some simple test cases it works. If I use a tool like apache ab
for a perfomance test, I get some weird problems. Running the server
on OS X 10.8.2 the system becomes unresponsive. I can scroll in open
windows, but opening new windows or killing the server isn't possible.
Testing it on an actual Debian Linux with gdb shows a "glibc detected
corrupted double-linked list" error and the server receives a SIGSEGV.
I tried 2.1.1 alpha and 2.1.2 alpha. (I need the 2.1 branch because of
the new EVLOOP_NO_EXIT_ON_EMPTY.)
Thanks,
Björn
=
Code
=
static void acceptcb(struct evconnlistener *listener, int sock, struct
sockaddr *sa, int sa_len, void *arg) {
struct bufferevent *bev;
SSL_CTX *server_ctx;
SSL *client_ctx;
server_ctx = (SSL_CTX *)arg;
client_ctx = SSL_new(server_ctx);
bev = bufferevent_openssl_socket_new(thread_base[nextFree(threads)],
sock, client_ctx,
BUFFEREVENT_SSL_ACCEPTING,
BEV_OPT_CLOSE_ON_FREE|BEV_OPT_THREADSAFE);
bufferevent_setcb(bev, readcb, NULL, NULL, NULL);
bufferevent_enable(bev, EV_READ);
}
static void *worker(void *ptr) {
struct event_base **evbase = (struct event_base **)ptr;
*evbase = event_base_new();
event_base_loop(*evbase, EVLOOP_NO_EXIT_ON_EMPTY);
pthread_exit(NULL);
}
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Re: [Libevent-users] multithreading problem
Try JMeter. I believe AB has bugs.
Sent from my iPhone
On Dec 16, 2012, at 10:52 AM, Björn K. wrote:
> Hello,
>
> I'm trying to write a simple https server which utilizes multiple cpu cores.
> I call evthread_use_pthreads() and create several pthreads. My
> acceptcb and the thread worker functions are below.
> For some simple test cases it works. If I use a tool like apache ab
> for a perfomance test, I get some weird problems. Running the server
> on OS X 10.8.2 the system becomes unresponsive. I can scroll in open
> windows, but opening new windows or killing the server isn't possible.
> Testing it on an actual Debian Linux with gdb shows a "glibc detected
> corrupted double-linked list" error and the server receives a SIGSEGV.
> I tried 2.1.1 alpha and 2.1.2 alpha. (I need the 2.1 branch because of
> the new EVLOOP_NO_EXIT_ON_EMPTY.)
>
> Thanks,
> Björn
>
> =
> Code
> =
>
> static void acceptcb(struct evconnlistener *listener, int sock, struct
> sockaddr *sa, int sa_len, void *arg) {
>
>struct bufferevent *bev;
>SSL_CTX *server_ctx;
>SSL *client_ctx;
>
>server_ctx = (SSL_CTX *)arg;
>client_ctx = SSL_new(server_ctx);
>
>bev = bufferevent_openssl_socket_new(thread_base[nextFree(threads)],
> sock, client_ctx,
> BUFFEREVENT_SSL_ACCEPTING,
>
> BEV_OPT_CLOSE_ON_FREE|BEV_OPT_THREADSAFE);
>
>bufferevent_setcb(bev, readcb, NULL, NULL, NULL);
>bufferevent_enable(bev, EV_READ);
>
> }
>
>
> static void *worker(void *ptr) {
>
>struct event_base **evbase = (struct event_base **)ptr;
>*evbase = event_base_new();
>
>event_base_loop(*evbase, EVLOOP_NO_EXIT_ON_EMPTY);
>
>pthread_exit(NULL);
>
> }
> ***
> To unsubscribe, send an e-mail to majord...@freehaven.net with
> unsubscribe libevent-usersin the body.
***
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Re: [Libevent-users] multithreading problem
On Sun, Dec 16, 2012 at 10:52 AM, Björn K. wrote: > Hello, > > I'm trying to write a simple https server which utilizes multiple cpu cores. > I call evthread_use_pthreads() and create several pthreads I can't tell without looking at the rest of the program, but are you sharing one event_base among all these threads? You can't run event_base_loop or event_base_dispatch on the same event_base from more than one thread at once. To do what you want, you could either have one event_base per thread, and some mechanism to assign each incoming connection gets assigned to a separate event_base, or you could have one event_base, and use worker threads to do the work of actually parsing HTTP and answering HTTP requests. For an example of an existing library that does what you want (multithreaded high-performance HTTP with SSL in Libevent), see Mark Ellzey's libevhtp at https://github.com/ellzey/libevhtp . yrs, -- Nick *** To unsubscribe, send an e-mail to majord...@freehaven.net with unsubscribe libevent-usersin the body.
