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/**
* @file llstatslistener.cpp
* @brief EventAPI interface for querying performance statistics
*
* $LicenseInfo:firstyear=2026&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2026, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "llstatslistener.h"
#include "llinventorymodel.h"
#include "llinventorymodelbackgroundfetch.h"
#include "llimagegl.h"
#include "llviewerstats.h"
namespace
{
template <typename STAT, typename EXTRACTOR>
LLSD collectPeriodArray(LLTrace::PeriodicRecording& recording,
size_t num_periods,
const STAT& stat,
EXTRACTOR extractor)
{
LLSD values = LLSD::emptyArray();
for (size_t i = 1; i <= num_periods; ++i)
{
LLTrace::Recording& period = recording.getPrevRecording(i);
if (period.hasValue(stat))
{
values.append((F64)extractor(period, stat));
}
}
return values;
}
template <typename STAT, typename EXTRACTOR>
void setPeriodArray(LLSD& out,
const char* key,
LLTrace::Recording& last,
LLTrace::PeriodicRecording& recording,
size_t num_periods,
const STAT& stat,
EXTRACTOR extractor)
{
if (last.hasValue(stat))
{
out[key] = collectPeriodArray(recording, num_periods, stat, extractor);
}
}
}
LLStatsListener::LLStatsListener()
: LLEventAPI("LLStats", "Query performance statistics")
{
add("getPerfData",
"Get performance data from the frame recording buffer, plus texture memory\n"
"and inventory loading timing information.\n"
"Reply contains [\"stats\"] with nested group maps.",
&LLStatsListener::getPerfData,
llsd::map("reply", LLSD()));
}
void LLStatsListener::getPerfData(LLSD const & evt)
{
LLEventAPI::Response response(LLSD(), evt);
// get_frame_recording() is a PeriodicRecording with 200 periods
LLTrace::PeriodicRecording& recording = LLTrace::get_frame_recording();
LLTrace::Recording& last = recording.getLastRecording();
size_t num_periods = recording.getNumRecordedPeriods();
F64 total_duration = recording.getDuration().value();
LLSD stats;
stats["total_periods_duration"] = total_duration;
stats["num_periods"] = (LLSD::Integer)num_periods;
LLSD frametime;
setPeriodArray(frametime, "fps", last, recording, num_periods, LLStatViewer::FPS,
[](LLTrace::Recording& period, const auto& stat) { return period.getPerSec(stat); });
setPeriodArray(frametime, "frame_time_ms", last, recording, num_periods, LLStatViewer::FRAMETIME,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(frametime, "do_frame_time_us", last, recording, num_periods, LLStatViewer::DOFRAME_TIME_US,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(frametime, "frame_time_jitter_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_JITTER,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
// Normalized jitter - scalar samples updated per frame
// report the current (last) value since they are session/period rolling stats
if (last.hasValue(LLStatViewer::NOTRMALIZED_FRAMETIME_JITTER_SESSION))
{
frametime["normalized_jitter_session"] = last.getLastValue(LLStatViewer::NOTRMALIZED_FRAMETIME_JITTER_SESSION);
}
if (last.hasValue(LLStatViewer::NORMALIZED_FRAMTIME_JITTER_PERIOD))
{
frametime["normalized_jitter_period"] = last.getLastValue(LLStatViewer::NORMALIZED_FRAMTIME_JITTER_PERIOD);
}
if (last.hasValue(LLStatViewer::NFTV))
{
frametime["normalized_frametime_variation"] = last.getLastValue(LLStatViewer::NFTV);
}
// Jitter event minute counters: running avg per minute and count in last completed minute
// These are already minute-window aggregates, so sending single value, not arrays
if (last.hasValue(LLStatViewer::FRAMETIME_JITTER_EVENTS_PER_MINUTE))
{
frametime["frame_time_jitter_events_per_minute"] = (F64)last.getLastValue(LLStatViewer::FRAMETIME_JITTER_EVENTS_PER_MINUTE);
}
if (last.hasValue(LLStatViewer::FRAMETIME_JITTER_EVENTS_LAST_MINUTE))
{
frametime["frame_time_jitter_events_last_minute"] = (F64)last.getLastValue(LLStatViewer::FRAMETIME_JITTER_EVENTS_LAST_MINUTE);
}
// Jitter percentiles / cumulative
setPeriodArray(frametime, "jitter_cumulative_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_JITTER_CUMULATIVE,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(frametime, "jitter_99th_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_JITTER_99TH,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(frametime, "jitter_95th_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_JITTER_95TH,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(frametime, "jitter_stddev_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_JITTER_STDDEV,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
// Frame time percentiles
setPeriodArray(frametime, "frametime_99th_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_99TH,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(frametime, "frametime_95th_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_95TH,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(frametime, "frametime_stddev_ms", last, recording, num_periods, LLStatViewer::FRAMETIME_STDDEV,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
// Frametime jitter event count
setPeriodArray(frametime, "frametime_jitter_events", last, recording, num_periods, LLStatViewer::FRAMETIME_JITTER_EVENTS,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
stats["frametime"] = frametime;
LLSD other;
// Packet loss
setPeriodArray(other, "packet_loss_percent", last, recording, num_periods, LLStatViewer::PACKETS_LOST_PERCENT,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
// Sim ping
setPeriodArray(other, "sim_ping_ms", last, recording, num_periods, LLStatViewer::SIM_PING,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
// Triangle rendering
setPeriodArray(other, "ktris_per_frame", last, recording, num_periods, LLStatViewer::TRIANGLES_DRAWN,
[](LLTrace::Recording& period, const auto& stat) { return period.getSum(stat); });
setPeriodArray(other, "ktris_per_sec", last, recording, num_periods, LLStatViewer::TRIANGLES_DRAWN,
[](LLTrace::Recording& period, const auto& stat) { return period.getPerSec(stat); });
// Object counts
setPeriodArray(other, "num_objects", last, recording, num_periods, LLStatViewer::NUM_OBJECTS,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
setPeriodArray(other, "num_active_objects", last, recording, num_periods, LLStatViewer::NUM_ACTIVE_OBJECTS,
[](LLTrace::Recording& period, const auto& stat) { return period.getMean(stat); });
stats["other"] = other;
// texture memory usage
LLSD memory;
memory["texture_bytes_alloc_mb"] = (F64)LLImageGL::getTextureBytesAllocated() / 1024.0 / 512.0;
stats["memory"] = memory;
LLSD inventory;
// library skeleton cache load duration
inventory["skeleton_load_time_library_seconds"] = gInventory.getLibrarySkeletonLoadTime();
// agent skeleton cache load duration
inventory["skeleton_load_time_agent_seconds"] = gInventory.getAgentSkeletonLoadTime();
// initial recursive inventory/library background fetch duration
inventory["initial_fetch_time_seconds"] = LLInventoryModelBackgroundFetch::instance().getInitialFetchDuration();
inventory["fetch_completed"] = LLInventoryModelBackgroundFetch::instance().isEverythingFetched();
stats["inventory"] = inventory;
response["stats"] = stats;
}
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