8. PopVision trace instrumentation library (PVTI)¶

PVTI API.

namespace pvti¶

TraceChannels

PVTI library predefined trace categories.

These predefined channels can be enabled or disabled at runtime. Tracepoints can be created using these channels, or custom channels can be added.

TraceChannel traceDrivers¶

TraceChannel tracePoplar¶

TraceChannel traceFramework¶

Typedefs

typedef struct pvti::TraceChannel TraceChannel¶

PVTI trace categories type definition.

Use for defining custom channels.

Functions

void enableTraceChannel(TraceChannel *channel)¶

Enable tracing channel for the session.

PVTI_OPTIONS environment variable must be set, and trace enabled. See “Configuring trace options” for more information.

Parameters

channel: A pointer to the channel to be enabled.

void disableTraceChannel(TraceChannel *channel)¶

Disable tracing channel for the session.

Parameters

channel: A pointer to the channel to be disabled.

bool checkTraceChannel(TraceChannel *channel)¶

Check if tracing channel is enabled.

Return

True if the channel is enabled, false if it is disabled.

Parameters

channel: A pointer to the channel to check.

std::vector<TraceChannel*> listTraceChannel(void)¶

Get a list of all traceChannels in the session.

Return: A vector of pointers to the traceChannels in the session.

std::string getCurrentTraceFilename(void)¶

Get the current trace session filename.

Return: The current trace session filename.

void closeTrace()¶

Close the current trace session.

No Tracepoint events should be invoked following this function call.

struct TraceChannel

#include <pvti.hpp>

PVTI trace categories type definition.

Use for defining custom channels.

Public Functions

TraceChannel(const char *name, bool enabled = true)¶

Construct a TraceChannel object, and add it to the current session.

Parameters

name: The channel name.
enabled: Set this to true to enable the channel when it is declared. enableTraceChannel() and disableTraceChannel() can be used to enable or disable channels at runtime.

Public Members

const char *name¶

bool enabled¶

class Tracepoint¶

#include <pvti.hpp>

Class for managing tracing of events.

Public Functions

Tracepoint(TraceChannel *traceChannel, const std::string traceLabel)¶

Profile a function or a scope by creating a named stack object of Tracepoint type.

Parameters

traceChannel: The channel to create the tracepoint for
traceLabel: A unique user-friendly string for this scope’s trace.

Tracepoint(TraceChannel *traceChannel, const char *traceLabel, const int32_t traceLabelLen = -1)¶

Profile a function or a scope by creating a named stack object of Tracepoint type.

Parameters

traceChannel: The channel to create the tracepoint for.
traceLabel: A unique user-friendly string for this scope’s trace.
traceLabelLen: The number of characters to use from the traceLabel (-1 indicates all).

~Tracepoint()¶: Invoked on Tracepoint function exit.

Tracepoint(const Tracepoint&) = delete¶

Tracepoint &operator=(const Tracepoint&) = delete¶

Public Static Functions

void begin(TraceChannel *traceChannel, const std::string traceLabel)¶

Start profiling a region using this function.

Should be complemented with an end() to profile between the two.

Parameters

traceChannel: The channel to create tracepoints for.
traceLabel: A unique user-friendly string for this region’s trace.

void begin(TraceChannel *traceChannel, const char *traceLabel, const int32_t traceLabelLen = -1)¶

Start profiling a region using this function.

Should be complemented with with an end() to profile between the two.

Parameters

traceChannel: The channel to create tracepoints for.
traceLabel: A unique user-friendly string for this region’s trace.
traceLabelLen: The number of characters to use from the traceLabel (-1 indicates all).

void end(TraceChannel *traceChannel, const std::string traceLabel)¶

End profiling a region using this function.

Should be the complement to a begin() to profile between the two.

Parameters

traceChannel: The channel to create tracepoints for.
traceLabel: A unique user-friendly string for this region’s trace.

void end(TraceChannel *traceChannel, const char *traceLabel, const int32_t traceLabelLen = -1)¶

End profiling a region using this function.

Should be the complement to a begin() to profile between the two.

Parameters

traceChannel: The channel to create tracepoints for.
traceLabel: A unique user-friendly string for this region’s trace.
traceLabelLen: The number of characters to use from the traceLabel (-1 indicates all).

void event(TraceChannel *traceChannel, const std::string traceLabel)¶

Mark an occurrence to be instrumented.

Can be used to compute duration between two events of the same or different type.

Parameters

traceChannel: The channel to create tracepoints for.
traceLabel: A unique user-friendly string for this event.

void event(TraceChannel *traceChannel, const char *traceLabel, const int32_t len = -1)¶

Mark an occurrence to be instrumented.

Can be used to compute duration between two events of same or different type.

Parameters

traceChannel: The channel to create tracepoints for.
traceLabel: A unique user-friendly string for this event.
traceLabelLen: The number of characters to use from the traceLabel (-1 indicates all).

Private Members

TraceChannel *channel¶

const std::string label¶

const char *strLabel¶

const int32_t strLabelLen¶