Movatterモバイル変換

This section describes the error log management functions of the CUDA runtime application programming interface. The Error Log Management interface will operate on both the CUDA Driver and CUDA Runtime.

Typedefs

void(CUDART_CB* cudaLogsCallback_t )( void* data, cudaLogLevel logLevel, char* message, size_t length )

Type of public error reporting callback functions.

Parameters

data

User parameter provided at registration

cudaLogLevel logLevel

message

Error log message being reported

size_t length

Functions

__host__ ​cudaError_t cudaLogsCurrent ( cudaLogIterator* iterator_out, unsigned int flags )

Sets log iterator to point to the end of log buffer, where the next message would be written.

Parameters

iterator_out

- Location to store an iterator to the current tail of the logs

flags

- Reserved for future use, must be 0

Returns

cudaSuccess,cudaErrorInvalidValue,

Description

__host__ ​cudaError_t cudaLogsDumpToFile ( cudaLogIterator* iterator, const char* pathToFile, unsigned int flags )

Dump accumulated driver logs into a file.

Parameters

iterator

- Optional auto-advancing iterator specifying the starting log to read. NULL value dumps all logs.

pathToFile

- Path to output file for dumping logs

flags

- Reserved for future use, must be 0

Returns

cudaSuccess,cudaErrorInvalidValue,

Description

Logs generated by the driver are stored in an internal buffer and can be copied out using this API. This API dumps all driver logs starting fromiterator intopathToFile provided.

Note:

• iterator is auto-advancing. Dumping logs will update the value ofiterator to receive the next generated log.

• The driver reserves limited memory for storing logs. The oldest logs may be overwritten and become unrecoverable. An indication will appear in the destination outupt if the logs have been truncated. Call dump after each failed API to mitigate this risk.

__host__ ​cudaError_t cudaLogsDumpToMemory ( cudaLogIterator* iterator, char* buffer, size_t* size, unsigned int flags )

Dump accumulated driver logs into a buffer.

Parameters

iterator

- Optional auto-advancing iterator specifying the starting log to read. NULL value dumps all logs.

buffer

- Pointer to dump logs

size

- See description

flags

- Reserved for future use, must be 0

Returns

cudaSuccess,cudaErrorInvalidValue,

Description

Logs generated by the driver are stored in an internal buffer and can be copied out using this API. This API dumps driver logs fromiterator intobuffer up to the size specified in*size. The driver will always null terminate the buffer but there will not be a null character between log entries, only a newline \n. The driver will then return the actual number of bytes written in*size, excluding the null terminator. If there are no messages to dump,*size will be set to 0 and the function will returnCUDA_SUCCESS. If the providedbuffer is not large enough to hold any messages,*size will be set to 0 and the function will returnCUDA_ERROR_INVALID_VALUE.

Note:

• iterator is auto-advancing. Dumping logs will update the value ofiterator to receive the next generated log.

• The driver reserves limited memory for storing logs. The maximum size of the buffer is 25600 bytes. The oldest logs may be overwritten and become unrecoverable. An indication will appear in the destination outupt if the logs have been truncated. Call dump after each failed API to mitigate this risk.

• If the provided value in*size is not large enough to hold all buffered messages, a message will be added at the head of the buffer indicating this. The driver then computes the number of messages it is able to store inbuffer and writes it out. The final message inbuffer will always be the most recent log message as of when the API is called.

__host__ ​cudaError_t cudaLogsRegisterCallback (cudaLogsCallback_t callbackFunc, void* userData, cudaLogsCallbackHandle* callback_out )

Register a callback function to receive error log messages.

Parameters

callbackFunc

- The function to register as a callback

userData

- A generic pointer to user data. This is passed into the callback function.

callback_out

- Optional location to store the callback handle after it is registered

Returns

cudaSuccess,cudaErrorInvalidValue,

Description

__host__ ​cudaError_t cudaLogsUnregisterCallback ( cudaLogsCallbackHandle callback )

Unregister a log message callback.

Parameters

callback

- The callback instance to unregister from receiving log messages

Returns

cudaSuccess,cudaErrorInvalidValue,

Description