# NanoMQ Broker
The system configuration provides settings to control the number of task queue threads, the maximum number of concurrent tasks, and cache settings in the NanoMQ broker.
# Task Queue
# Example Configuration
system {
num_taskq_thread = 0 # Use a specified number of task queue threads
max_taskq_thread = 0 # Use a specified maximum number of task queue threads
parallel = 0 # Handle a specified maximum number of outstanding requests
}
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# Configuration Item
num_taskq_thread
: Specifies the number of task queue threads to use. The acceptable range is between 1 and 255. If the value is set to 0, the system automatically determines the number of threads.max_taskq_thread
: Specifies the maximum number of task queue threads to use. The acceptable range is between 1 and 255. If the value is set to 0, the system automatically determines the maximum number of threads.parallel
: Specifies the maximum number of outstanding requests that the system can handle at once. The acceptable range is between 1 and 255. If the value is set to 0, the system automatically determines the number of parallel tasks.
# Cache
NanoMQ uses SQLite to implement the caching for MQTT data bridges.
# Example Configuration
sqlite {
disk_cache_size = 102400 # Max message limitation for caching
mounted_file_path="/tmp/" # Mounted file path
flush_mem_threshold = 100 # The threshold of flushing messages to flash
resend_interval = 5000 # Resend interval (ms)
}
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# Configuration Items
disk_cache_size
: Specifies the maximum number of messages that can be cached in the SQLite database; default: 102400; Optional Values:- 0: Ineffecitve
- 1 - infinity
mounted_file_path
: Specifies the file path where the SQLite database file is mounted; default:nanomq running path
flush_mem_threshold
: Specifies the threshold for flushing messages to the SQLite database. When the number of messages reaches this threshold, they are flushed to the SQLite database; default: 100, Value range: 1-infinityresend_interval
: Specifies the interval, in milliseconds, for resending the messages after a failure is recovered. This is unrelated to the trigger for the resend operation; default: 5000. Note: Only work for the NanoMQ broker to resend cached messages to local client, not for bridging connections.
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