package debug

Import Path
	runtime/debug (on golang.org and go.dev)

Dependency Relation
	imports 5 packages, and imported by one package


Involved Source Files

	      garbage.go
	      mod.go
	
		Package debug contains facilities for programs to debug themselves while
		they are running.

	      stubs.go
	      debug.s


Package-Level Type Names (total 3)


	/* sort by:  |  */
	
		BuildInfo represents the build information read from
		the running binary.

		
			
				// Module dependencies

			
				// The module containing the main package

			
				// The main package path

		
			func ReadBuildInfo() (info *BuildInfo, ok bool)


	
		GCStats collect information about recent garbage collections.

		
			
				// time of last collection

			
				// number of garbage collections

			
				// pause history, most recent first

			
				// pause end times history, most recent first

			PauseQuantiles []time.Duration
			
				// total pause for all collections

		
			func ReadGCStats(stats *GCStats)


	
		Module represents a module.

		
			
				// module path

			
				// replaced by this module

			
				// checksum

			
				// module version





Package-Level Functions (total 11)


	
		FreeOSMemory forces a garbage collection followed by an
		attempt to return as much memory to the operating system
		as possible. (Even if this is not called, the runtime gradually
		returns memory to the operating system in a background task.)


	
		PrintStack prints to standard error the stack trace returned by runtime.Stack.


	
		ReadBuildInfo returns the build information embedded
		in the running binary. The information is available only
		in binaries built with module support.


	
		ReadGCStats reads statistics about garbage collection into stats.
		The number of entries in the pause history is system-dependent;
		stats.Pause slice will be reused if large enough, reallocated otherwise.
		ReadGCStats may use the full capacity of the stats.Pause slice.
		If stats.PauseQuantiles is non-empty, ReadGCStats fills it with quantiles
		summarizing the distribution of pause time. For example, if
		len(stats.PauseQuantiles) is 5, it will be filled with the minimum,
		25%, 50%, 75%, and maximum pause times.


	
		SetGCPercent sets the garbage collection target percentage:
		a collection is triggered when the ratio of freshly allocated data
		to live data remaining after the previous collection reaches this percentage.
		SetGCPercent returns the previous setting.
		The initial setting is the value of the GOGC environment variable
		at startup, or 100 if the variable is not set.
		A negative percentage disables garbage collection.


	
		SetMaxStack sets the maximum amount of memory that
		can be used by a single goroutine stack.
		If any goroutine exceeds this limit while growing its stack,
		the program crashes.
		SetMaxStack returns the previous setting.
		The initial setting is 1 GB on 64-bit systems, 250 MB on 32-bit systems.
		There may be a system-imposed maximum stack limit regardless
		of the value provided to SetMaxStack.

		SetMaxStack is useful mainly for limiting the damage done by
		goroutines that enter an infinite recursion. It only limits future
		stack growth.


	
		SetMaxThreads sets the maximum number of operating system
		threads that the Go program can use. If it attempts to use more than
		this many, the program crashes.
		SetMaxThreads returns the previous setting.
		The initial setting is 10,000 threads.

		The limit controls the number of operating system threads, not the number
		of goroutines. A Go program creates a new thread only when a goroutine
		is ready to run but all the existing threads are blocked in system calls, cgo calls,
		or are locked to other goroutines due to use of runtime.LockOSThread.

		SetMaxThreads is useful mainly for limiting the damage done by
		programs that create an unbounded number of threads. The idea is
		to take down the program before it takes down the operating system.


	
		SetPanicOnFault controls the runtime's behavior when a program faults
		at an unexpected (non-nil) address. Such faults are typically caused by
		bugs such as runtime memory corruption, so the default response is to crash
		the program. Programs working with memory-mapped files or unsafe
		manipulation of memory may cause faults at non-nil addresses in less
		dramatic situations; SetPanicOnFault allows such programs to request
		that the runtime trigger only a panic, not a crash.
		The runtime.Error that the runtime panics with may have an additional method:
		    Addr() uintptr
		If that method exists, it returns the memory address which triggered the fault.
		The results of Addr are best-effort and the veracity of the result
		may depend on the platform.
		SetPanicOnFault applies only to the current goroutine.
		It returns the previous setting.


	
		SetTraceback sets the amount of detail printed by the runtime in
		the traceback it prints before exiting due to an unrecovered panic
		or an internal runtime error.
		The level argument takes the same values as the GOTRACEBACK
		environment variable. For example, SetTraceback("all") ensure
		that the program prints all goroutines when it crashes.
		See the package runtime documentation for details.
		If SetTraceback is called with a level lower than that of the
		environment variable, the call is ignored.


	
		Stack returns a formatted stack trace of the goroutine that calls it.
		It calls runtime.Stack with a large enough buffer to capture the entire trace.


	
		WriteHeapDump writes a description of the heap and the objects in
		it to the given file descriptor.

		WriteHeapDump suspends the execution of all goroutines until the heap
		dump is completely written.  Thus, the file descriptor must not be
		connected to a pipe or socket whose other end is in the same Go
		process; instead, use a temporary file or network socket.

		The heap dump format is defined at https://golang.org/s/go15heapdump.