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 c5a0e4a7a36d54957e2c96312a796782e1b7e90a..c216d8d2627344264d940e4ab7a8d1a3db26c6d5 100644 (file)
--- 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_;