diff options
| -rw-r--r-- | docs/users_guide/8.10.1-notes.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/docs/users_guide/8.10.1-notes.rst b/docs/users_guide/8.10.1-notes.rst index 026e93fa7e..ac2d9180d7 100644 --- a/docs/users_guide/8.10.1-notes.rst +++ b/docs/users_guide/8.10.1-notes.rst @@ -266,6 +266,25 @@ Runtime system out-of-the-box compatibility with OpenBSD and macOS Catalina (see :ghc-ticket:`17353`) +- The RTS API now exposes :ref:`an interface <event_log_output_api>` to + configure ``EventLogWriters``, allowing eventlog data to fed to sinks other + than ``.eventlog`` files. + +- A new ``+RTS`` flag ``--disable-delayed-os-memory-return`` was added to make + for accurate resident memory usage of the program as shown in memory + usage reporting tools (e.g. the ``RSS`` column in ``top`` and ``htop``). + + This makes it easier to check the real memory usage of Haskell programs. + + Using this new flag is expected to make the program slightly slower. + + Without this flag, the (Linux) RTS returns unused memory "lazily" to the OS. + This has making the memory available to other processes while also allowing + the RTS to re-use the memory very efficiently (without zeroing pages) in case + it needs it again, but common tools will incorrectly show such memory as + occupied by the RTS (because they do not process the ``LazyFree`` field in + ``/proc/PID/smaps``). + Template Haskell ~~~~~~~~~~~~~~~~ |