From 94e7bb87bce6821e91734f1fcbb6cfd61a008049 Mon Sep 17 00:00:00 2001 From: eunhhu Date: Thu, 1 Oct 2026 08:52:43 +0100 Subject: Push a turn's sends to a link at once, and round only the links that want one (017, 2b-1) The sending loop was woken by every record queued while it slept: the owner queues one by one, the loop caught up and slept between them, and every link took a round on every wake. Four links sent 64k packets of 12 records where threads sent 40k of 20, and ran at 257k sends/s against 581k. The owner now queues a turn's sends and pushes each link once; the loop rounds a link only when its socket has answers, it was pushed, or its time came. --- research/experiments/019-idle-links/transport.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'research/experiments/019-idle-links/transport.c') diff --git a/research/experiments/019-idle-links/transport.c b/research/experiments/019-idle-links/transport.c index 3a531ef..4560850 100644 --- a/research/experiments/019-idle-links/transport.c +++ b/research/experiments/019-idle-links/transport.c @@ -191,6 +191,7 @@ int main(int argc, char **argv) { if (!window) /* a backlog: all queued before the link starts */ for (; first <= count; ++first) if (!pure_link_queue(link, first, payload, payload_size)) return fputs("transport: cannot queue\n", stderr), 1; + if (!window) pure_link_push(link); began = now_ns(); uint64_t cpu_link = 0, cpu_listen = thread_cpu("pure-listen"), cpu_all = thread_cpu(NULL); uint64_t end = limit > 0 ? began + (uint64_t)(limit * 1e9) : UINT64_MAX; @@ -204,13 +205,14 @@ int main(int argc, char **argv) { if (now_ns() >= end) break; if (queued_at) queued_at[seq] = now_ns(); if (!pure_link_queue(link, seq, payload, payload_size)) return fputs("transport: cannot queue\n", stderr), 1; + pure_link_push(link); } while (pure_link_delivered(link) < count && now_ns() < end) { struct timespec pause = {0, 50000}; nanosleep(&pause, NULL); } double seconds = (double)((end < now_ns() ? end : now_ns()) - began) / 1e9; - uint64_t link_ns = thread_cpu("pure-link") - cpu_link, listen_ns = thread_cpu("pure-listen") - cpu_listen, + uint64_t link_ns = thread_cpu("pure-send") - cpu_link, listen_ns = thread_cpu("pure-listen") - cpu_listen, all_ns = thread_cpu(NULL) - cpu_all; PureLinkCounts sent, got; pure_link_counts(link, &sent); -- cgit v1.2.3