compilation. When --trim is specified in a command used to build a system image, the compiler begins tracing calls starting at methods marked using Base.Experimental.entrypoint. If a call is too dynamic to it is still valid code.CHAPTER 106. DOCUMENTATION OF JULIA'S INTERNALS 1967 Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 107.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The

compilation. When --trim is specified in a command used to build a system image, the compiler begins tracing calls starting at methods marked using Base.Experimental.entrypoint. If a call is too dynamic to checked against the global method table to determine if it is still valid code. Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 107.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The

compilation. When --trim is specified in a command used to build a system image, the compiler begins tracing calls starting at methods marked using Base.Experimental.entrypoint. If a call is too dynamic to checked against the global method table to determine if it is still valid code. Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 107.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The

compilation. When --trim is specified in a command used to build a system image, the compiler begins tracing calls starting at methods marked using Base.Experimental.entrypoint. If a call is too dynamic to checked against the global method table to determine if it is still valid code. Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 107.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The

compilation. When --trim is specified in a command used to build a system image, the compiler begins tracing calls starting at methods marked using Base.Experimental.entrypoint. If a call is too dynamic to checked against the global method table to determine if it is still valid code. Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 106.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The

checked against the global method table to determine if it is still valid code. Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 106.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The a second terminal > sudo contrib/bpftrace/gc_stop_the_world_latency.bt Attaching 4 probes... Tracing Julia GC Stop-The-World Latency... Hit Ctrl-C to end. ^C @usecs[1743412]: [4, 8) 971 |@@@@@@@

checked against the global method table to determine if it is still valid code. Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 106.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The a second terminal > sudo contrib/bpftrace/gc_stop_the_world_latency.bt Attaching 4 probes... Tracing Julia GC Stop-The-World Latency... Hit Ctrl-C to end. ^C @usecs[1743412]: [4, 8) 971 |@@@@@@@

checked against the global method table to determine if it is still valid code. Compiling Methods Tracing Compiled Methods Julia has a command-line flag to record all of the methods that are compiled by is enabled. 106.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The a second terminal > sudo contrib/bpftrace/gc_stop_the_world_latency.bt Attaching 4 probes... Tracing Julia GC Stop-The-World Latency... Hit Ctrl-C to end. ^C @usecs[1743412]: [4, 8) 971 |@@@@@@@

is enabled. 102.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The a second terminal > sudo contrib/bpftrace/gc_stop_the_world_latency.bt Attaching 4 probes... Tracing Julia GC Stop-The-World Latency... Hit Ctrl-C to end. ^C @usecs[1743412]:CHAPTER 102. DEVELOPING/DEBUGGING to be an absolute path on a production system. Useful references: • Julia Evans blog on Linux tracing systems • LWN article on USDT and BPF • GDB support for probes • Brendan Gregg – Linux PerformanceChapter

is enabled. 102.4 External Profiler Support Julia provides explicit support for some external tracing profilers, enabling you to obtain a high-level overview of the runtime's execution behavior. The a second terminal > sudo contrib/bpftrace/gc_stop_the_world_latency.bt Attaching 4 probes... Tracing Julia GC Stop-The-World Latency... Hit Ctrl-C to end. ^C @usecs[1743412]:CHAPTER 102. DEVELOPING/DEBUGGING to be an absolute path on a production system. Useful references: • Julia Evans blog on Linux tracing systems • LWN article on USDT and BPF • GDB support for probes • Brendan Gregg – Linux PerformanceChapter