2025-02-03 10:25:05 -05:00
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## Runtime {#runtime}
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2025-01-31 15:03:15 -08:00
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<!-- go.dev/issue/71517 -->
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The message printed when a program exits due to an unhandled panic
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2025-05-05 12:33:46 -04:00
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that was recovered and repanicked no longer repeats the text of
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2025-01-31 15:03:15 -08:00
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the panic value.
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Previously, a program which panicked with `panic("PANIC")`,
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2025-05-05 12:33:46 -04:00
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recovered the panic, and then repanicked with the original
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2025-01-31 15:03:15 -08:00
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value would print:
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panic: PANIC [recovered]
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panic: PANIC
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This program will now print:
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2025-05-05 12:33:46 -04:00
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panic: PANIC [recovered, repanicked]
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2025-03-07 13:53:34 -05:00
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<!-- go.dev/issue/71546 -->
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On Linux systems with kernel support for anonymous VMA names
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(`CONFIG_ANON_VMA_NAME`), the Go runtime will annotate anonymous memory
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mappings with context about their purpose. e.g., `[anon: Go: heap]` for heap
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memory. This can be disabled with the [GODEBUG setting](/doc/godebug)
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`decoratemappings=0`.
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2025-05-09 19:54:01 +00:00
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<!-- go.dev/issue/73581 -->
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A new experimental garbage collector is now available as an experiment. The
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new design aims to improve the efficiency of garbage collection through better
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locality and CPU scalability in the mark algorithm. Benchmark result vary, but
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we expect somewhere between a 10—40% reduction in garbage collection overhead
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in real-world programs that heavily use the garbage collector.
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The new garbage collector may be enabled by setting `GOEXPERIMENT=greenteagc`
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at build time. See the [GitHub issue](/issue/73581) for more details on the design
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and instructions on how to report feedback.
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