From: Uwe Hermann <redacted>
Date: Mon, 6 Mar 2017 07:41:42 +0000 (+0100)
Subject: Increase decoding chunk size for much better performance.
X-Git-Tag: pulseview-0.4.0~176
X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=commitdiff_plain;h=4e6301f9744f2c97b6ee7982ba56903f63cc455e

Increase decoding chunk size for much better performance.

Increasing the (max) decoding chunk size from 4ksamples to 10Msamples
leads to massively faster protocol decoding due to reduced overhead
related to srd_session_send() and other functions invoked internally.

In some cases a 2x (or more) speed-up has been observed.
---

diff --git a/pv/data/decoderstack.cpp b/pv/data/decoderstack.cpp
index c5a0e4a7..c216d8d2 100644
--- a/pv/data/decoderstack.cpp
+++ b/pv/data/decoderstack.cpp
@@ -53,7 +53,7 @@ namespace data {
 
 const double DecoderStack::DecodeMargin = 1.0;
 const double DecoderStack::DecodeThreshold = 0.2;
-const int64_t DecoderStack::DecodeChunkLength = 4096;
+const int64_t DecoderStack::DecodeChunkLength = 10 * 1024 * 1024;
 const unsigned int DecoderStack::DecodeNotifyPeriod = 1024;
 
 mutex DecoderStack::global_srd_mutex_;