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lightningd: log IO only on actual output.

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This causes natural batching, rather than on every little addition of
JSON formatting.

Before, to listchannels 100,000 channels took 82.48 seconds, after
6.82 seconds.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-04-08 09:22:19 +09:30
parent 3dd47950ad
commit 6cac2c959e
1 changed files with 3 additions and 5 deletions
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8
lightningd/json_stream.c
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@ -116,8 +116,6 @@ static void js_written_some(struct json_stream *js)
void json_stream_append_part(struct json_stream *js, const char *str, size_t len)
{
mkroom(js, len);
if (js->log)
log_io(js->log, LOG_IO_OUT, "", str, len);
memcpy(membuf_add(&js->outbuf, len), str, len);
js_written_some(js);
}
@ -148,9 +146,6 @@ static void json_stream_append_vfmt(struct json_stream *js,
mkroom(js, fmtlen + 1);
vsprintf(membuf_space(&js->outbuf), fmt, ap2);
}
if (js->log)
log_io(js->log, LOG_IO_OUT, "",
membuf_space(&js->outbuf), fmtlen);
membuf_added(&js->outbuf, fmtlen);
js_written_some(js);
va_end(ap2);
@ -296,6 +291,9 @@ static struct io_plan *json_stream_output_write(struct io_conn *conn,
}
js->reader = conn;
if (js->log)
log_io(js->log, LOG_IO_OUT, "",
membuf_elems(&js->outbuf), js->len_read);
return io_write(conn,
membuf_elems(&js->outbuf), js->len_read,
json_stream_output_write, js);