Skip to content

H2O: Track connection load across the worker threads #9520

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jan 13, 2025
Merged

H2O: Track connection load across the worker threads #9520

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
29 changes: 29 additions & 0 deletions frameworks/C/h2o/src/event_loop.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -32,13 +32,16 @@
#include <netinet/tcp.h>
#include <openssl/ssl.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/types.h>

#include "error.h"
#include "event_loop.h"
#include "global_data.h"
#include "thread.h"
#include "utility.h"

#define CONN_NUM_SAMPLE_PERIOD 2500
#define DEFAULT_TCP_FASTOPEN_QUEUE_LEN 4096

static void accept_connection(h2o_socket_t *listener, const char *err);
Expand Down Expand Up @@ -72,6 +75,7 @@ static void accept_connection(h2o_socket_t *listener, const char *err)
if (!sock)
break;

ctx->event_loop.accepted_conn_num++;
ctx->event_loop.conn_num++;
sock->on_close.cb = on_close_connection;
sock->on_close.data = &ctx->event_loop.conn_num;
Expand Down Expand Up @@ -277,11 +281,36 @@ static void start_accept_polling(const config_t *config,

void event_loop(struct thread_context_t *ctx)
{
uint64_t last_sample = 0;

while (!ctx->shutdown || ctx->event_loop.conn_num) {
h2o_evloop_run(ctx->event_loop.h2o_ctx.loop, INT32_MAX);
process_messages(&ctx->global_thread_data->h2o_receiver,
&ctx->event_loop.local_messages);

const uint64_t now = h2o_now(ctx->event_loop.h2o_ctx.loop);

if (now - last_sample > CONN_NUM_SAMPLE_PERIOD || last_sample > now) {
const size_t i = ctx->event_loop.conn_num_sample_idx;

ctx->event_loop.conn_num_sample[i] = ctx->event_loop.conn_num;
ctx->event_loop.conn_num_sample_idx =
(i + 1) % ARRAY_SIZE(ctx->event_loop.conn_num_sample);
last_sample = now;
}
}

flockfile(stdout);
printf("Thread %ld statistics:\nAccepted connections: %zu\nConnection number samples: %zu",
syscall(SYS_gettid),
ctx->event_loop.accepted_conn_num,
*ctx->event_loop.conn_num_sample);

for (size_t i = 1; i < ARRAY_SIZE(ctx->event_loop.conn_num_sample); i++)
printf(",%zu", ctx->event_loop.conn_num_sample[i]);

putc_unlocked('\n', stdout);
funlockfile(stdout);
}

void free_event_loop(event_loop_t *event_loop, h2o_multithread_receiver_t *h2o_receiver)
Expand Down
5 changes: 5 additions & 0 deletions frameworks/C/h2o/src/event_loop.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,8 @@

#include "global_data.h"

#define CONN_NUM_SAMPLES 512

typedef enum {
SHUTDOWN,
TASK
Expand All @@ -41,6 +43,9 @@ typedef struct {
h2o_accept_ctx_t h2o_accept_ctx;
h2o_context_t h2o_ctx;
h2o_linklist_t local_messages;
size_t accepted_conn_num;
size_t conn_num_sample[CONN_NUM_SAMPLES];
size_t conn_num_sample_idx;
} event_loop_t;

typedef struct {
Expand Down
Loading