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Release Notes
Version 1.8.9

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# 1 Runtime_Tools Release Notes

This document describes the changes made to the Runtime_Tools application.

### 1.1 Runtime_Tools 1.8.9

#### Fixed Bugs and Malfunctions

- Change the module-level docs to give complete step-by-step instructions for using the `dyntrace:p()` trace function. (Thanks to Scott Lystig Fritchie)

  Own Id: OTP-10141

- Add 1024 separate USDT probes to dyntrace.erl and dyntrace.c (Thanks to Scott Lystig Fritchie)

  Own Id: OTP-10143

- Relocate bodies of DTrace probes to the statically-linked VM.

  Due to various operating systems (in both the DTrace and SystemTap worlds) not fully supporting DTrace probes (or SystemTap-compatibility mode probes) in shared libraries, we relocate those probes to the statically-linked virtual machine. This could be seen as pollution of the pristine VM by a (yet) experimental feature. However:

  1. This code can be eliminated completely by the C preprocessor. 2. Leaving the probes in the dyntrace NIF shared library simply does not work correctly on too many platforms. *Many* thanks to Macneil Shonle at Basho for assisting when my RSI-injured fingers gave out. (note: Solaris 10 and FreeBSD 9.0-RELEASE can take a long time to compile)

  Own Id: OTP-10189

### 1.2 Runtime_Tools 1.8.8

#### Improvements and New Features

- The DTrace source patch from Scott Lystig Fritchie is integrated in the source tree. Using an emulator with dtrace probe is still not supported for production use, but may be a valuable debugging tool. Configure with --with-dynamic-trace=dtrace (or --with-dynamic-trace=systemtap) to create a build with dtrace probes enabled. See runtime_tools for documentation and examples.

  Own Id: OTP-10017

### 1.3 Runtime_Tools 1.8.7

#### Fixed Bugs and Malfunctions

- Earlier dbg:stop only did erlang:trace_delivered and did not flush the trace file driver. Therefore there could still be trace messages that were delivered to the driver (guaranteed by erlang:trace_delivered) but not yet written to the file when dbg:stop returned. Flushing is now added on each node before the dbg process terminates.

  Own Id: OTP-9651

- File handles created by the trace_file_drv driver was inherited to child processes. This is now corrected.

  Own Id: OTP-9658

#### Improvements and New Features

- Erlang/OTP can now be built using parallel make if you limit the number of jobs, for instance using 'make -j6' or 'make -j10'. 'make -j' does not work at the moment because of some missing dependencies.

  Own Id: OTP-9451

- Two new built-in trace pattern aliases have been added: caller_trace (c) and caller_exception_trace (cx). See the dbg:ltp/0 documentation for more info.

  Own Id: OTP-9458

### 1.4 Runtime_Tools 1.8.6

#### Improvements and New Features

- Two new built-in trace pattern aliases have been added: caller_trace (c) and caller_exception_trace (cx). See the dbg:ltp/0 documentation for more info.

  Own Id: OTP-9458

### 1.5 Runtime_Tools 1.8.5

#### Improvements and New Features

- When a big number of trace patterns are set by inviso the Erlang VM could get unresponsive for several seconds. This is now corrected.

  Own Id: OTP-9048 Aux Id: seq11480

### 1.6 Runtime_Tools 1.8.4.1

#### Fixed Bugs and Malfunctions

- Minor corrections and removal of a temporary workaround.

  Own Id: OTP-8755 Aux Id: seq-11628, seq-11639

- Small fix in inviso_autostart_server.

  Own Id: OTP-8783 Aux Id: seq11628

### 1.7 Runtime_Tools 1.8.4

#### Improvements and New Features

- Miscellaneous updates.

  Own Id: OTP-8705

### 1.8 Runtime_Tools 1.8.3

#### Improvements and New Features

- Cross compilation improvements and other build system improvements.

  Most notable:

  - Lots of cross compilation improvements. The old cross compilation support was more or less non-existing as well as broken. Please, note that the cross compilation support should still be considered as experimental. Also note that old cross compilation configurations cannot be used without modifications. For more information on cross compiling Erlang/OTP see the $ERL_TOP/INSTALL-CROSS.md file.
  - Support for staged install using DESTDIR. The old broken INSTALL_PREFIX has also been fixed. For more information see the $ERL_TOP/INSTALL.md file.
  - Documentation of the release target of the top Makefile. For more information see the $ERL_TOP/INSTALL.md file.
  - make install now by default creates relative symbolic links instead of absolute ones. For more information see the $ERL_TOP/INSTALL.md file.
  - $ERL_TOP/configure --help=recursive now works and prints help for all applications with configure scripts.
  - Doing make install, or make release directly after make all no longer triggers miscellaneous rebuilds.
  - Existing bootstrap system is now used when doing make install, or make release without a preceding make all.
  - The crypto and ssl applications use the same runtime library path when dynamically linking against libssl.so and libcrypto.so. The runtime library search path has also been extended.
  - The configure scripts of erl_interface and odbc now search for thread libraries and thread library quirks the same way as erts do.
  - The configure script of the odbc application now also looks for odbc libraries in lib64 and lib/64 directories when building on a 64-bit system.
  - The config.h.in file in the erl_interface application is now automatically generated in instead of statically updated which reduces the risk of configure tests without any effect.

  (Thanks to Henrik Riomar for suggestions and testing)

  (Thanks to Winston Smith for the AVR32-Linux cross configuration and testing)

  *** POTENTIAL INCOMPATIBILITY ***

  Own Id: OTP-8323

- Cleanups suggested by tidier and modernization of types and specs.

  Own Id: OTP-8455

### 1.9 Runtime_Tools 1.8.2

#### Improvements and New Features

- The documentation is now built with open source tools (xsltproc and fop) that exists on most platforms. One visible change is that the frames are removed.

  Own Id: OTP-8201

### 1.10 Runtime_Tools 1.8.1

#### Fixed Bugs and Malfunctions

- Makefile.in has been updated to use the LDFLAGS environment variable (if set). (Thanks to Davide Pesavento.)

  Own Id: OTP-8157

### 1.11 Runtime_Tools 1.8

#### Improvements and New Features

- etop would crash if the emulator's custom allocators had been turned off (e.g. using the +Meamin option).

  Own Id: OTP-7519

- The copyright notices have been updated.

  Own Id: OTP-7851

- Now, dbg:p/2 accepts {X,Y,Z} process specification as stated in the documentation. It also now accepts "<X.Y.Z>" like from erlang:pid_to_list/1.

  There is now a pre-saved match spec in dbg that saves a lot of typing. Use dbg:ltp/0 to find out more...

  Own Id: OTP-7867

### 1.12 Runtime_Tools 1.7.3

#### Fixed Bugs and Malfunctions

- Fixed a timestamp problem where some events could be sent out of order. Minor fixes to presentation of data.

  Own Id: OTP-7544 Aux Id: otp-7442

### 1.13 Runtime_Tools 1.7.2

#### Fixed Bugs and Malfunctions

- etop now collects process information faster and more reliably than before (a race condition reported by Igor Goryachev has been eliminated).

  Trace messages could be lost when ttb:stop/0 was called.

  Own Id: OTP-7164

### 1.14 Runtime_Tools 1.7.1

#### Improvements and New Features

- The documentation has been updated so as to reflect the last updates of the Erlang shell as well as the minor modifications of the control sequence p of the io_lib module.

  Superfluous empty lines have been removed from code examples and from Erlang shell examples.

  Own Id: OTP-6944 Aux Id: OTP-6554, OTP-6911

- Memory management improvements especially for the runtime system with SMP support:

  - The runtime system with SMP support can now use multiple, thread specific instances of most memory allocators. This improves performance since it reduces lock contention in the memory allocators. It may however increase memory usage for some applications. The runtime system with SMP support will by default enable this feature on most allocators. The amount of instances used can be configured.
  - driver_alloc(), driver_realloc(), and driver_free() now use their own erts specific memory allocator instead of the default malloc() implementation on the system.
  - The default configuration of some allocators have been changed to fit applications that use much memory better.
  - Some new erts_alloc configuration parameters have been added.
  - erts_alloc_config has been modified to be able to create configurations suitable for multiple instances of allocators.
  - The returned value from erlang:system_info({allocator, Alloc}) has been changed. This since an allocator may now run in multiple instances.

  If you for some reason want the memory allocators to be configured as before, you can pass the +Mea r11b command-line argument to erl.

  For more information see the erts_alloc(3), the erts_alloc_config(3), and the erlang(3) documentation.

  *** POTENTIAL INCOMPATIBILITY ***

  Own Id: OTP-7100

### 1.15 Runtime_Tools 1.7

#### Fixed Bugs and Malfunctions

- dbg could leave traced processes in a suspended state if the tracer process was killed with exit reason kill.

  erlang:suspend_process/2 has been introduced which accepts an option list as second argument. For more information see the erlang(3) documentation.

  Processes suspended via erlang:suspend_process/[1,2] will now be automatically resumed if the process that called erlang:suspend_process/[1,2] terminates.

  Processes could previously be suspended by one process and resumed by another unless someone was tracing the suspendee. This is not possible anymore. The process resuming a process has to be the one that suspended it.

  *** POTENTIAL INCOMPATIBILITY ***

  Own Id: OTP-6946

#### Improvements and New Features

- The undocumented and unsupported function dbg:tracer/1 has been removed. The undocumented, unsupported, and broken function dbg:i/1 has been removed.

  Own Id: OTP-6939

### 1.16 Runtime_Tools 1.6.8

#### Fixed Bugs and Malfunctions

- In this release the following has been fixed and enhanced: Autostart: It is now possible to configure modules that shall be loaded by the autostart mechanism. This because it is not certain that all application systems make use of the OTP boot script to set up paths to all Erlang modules. Runtime_tools/Inviso: A bug in the fetch_log functionality has been fixed. Further a bug that was (supposedly) fixed in a previous patch concerning meta-tracer write_ti has been fixed (again) in this patch. A bug in inviso_as_lib making remote autostart config file updates fail has been fixed. Inviso: inviso_tool has been given a flush API.

  Own Id: OTP-6918

### 1.17 Runtime_Tools 1.6.7

#### Improvements and New Features

- The following bugs/improvements have been done: Internal interworking between inviso_rt and inviso_rt_meta. The call function used by inviso_rt to call inviso_rt_meta is now protected with a monitor. Inviso_rt_meta now includes the timestamp of the incoming meta trace message when calling the call-callback. (Makes it possible to add a "better" timestamp to the ti-file.) Bug in inviso_tool making it not remove trace patterns when terminating. Bug in internal function h_start_session making inviso_tool crash if there were no active nodes to start the session on. The user-inviso_tool and inviso API-inviso control component request/response gen_server protocols had default time-out. Since many trace operations can be time consuming, a longer time-out is necessary. Improved overload protection. It is now possible to let the overload protection renew itself (e.g after an exit from an external overload protector). Inviso_rt_meta now fully uses the exception_trace match spec action term. Run Trace Case API (as in contrast to activate and deactivate trace case APIs) in inviso_tool. Flush trace-port API added to inviso. Get_session_data API added to inviso_tool. Improved inviso_tool:stop making it possible to name nodes which shall not have their trace patterns removed when inviso_tool terminates. Bug in handling of writing multiple ti-entries if returned from a call/return_from call-back in inviso_rt_meta Process trace flags are no longer explicitly removed by the inviso_tool when it terminates. Not necessary. Inviso_tool get_autostart_data adopted to standard autostarter.

  *** INCOMPATIBILITY with Meta trace call-backs are called with different arguments now. ***

  Own Id: OTP-6881

### 1.18 Runtime_Tools 1.6.6

#### Fixed Bugs and Malfunctions

- A bug in inviso_rt_meta caused an ETS table containing information on initiated (init_tpm) functions to be lost when suspending tracing. Further an enhancement to inviso_rt has been introduced making it possible to activate process trace flags based on globally registered names. It is then not an error to activate a global name on a node where the name does not reside. The process count in the return value will simply be set to zero (hence exactly one node in the NodeResult part of the return value will indicate one matching process found). A bug was found in fetch_log API. At the same time the fetch_log functionality was enhanced to also offer flow control making fetcher processes send chunks of transferred file data at a slower pace.

  Own Id: OTP-6703

#### Improvements and New Features

- Minor Makefile changes.

  Own Id: OTP-6689 Aux Id: OTP-6742

- An experimental tool called erts_alloc_config has been added. erts_alloc_config is intended to be used to aid creation of an erts_alloc configuration that is suitable for a limited number of runtime scenarios. For more information see the erts_alloc_config(3) documentation.

  Own Id: OTP-6700

### 1.19 Runtime_Tools 1.6.5

#### Improvements and New Features

- Misc improvements.

  Own Id: OTP-6576

### 1.20 Runtime_Tools 1.6.4

#### Improvements and New Features

- This application has been updated to eliminate warnings by Dialyzer.

  Own Id: OTP-6551

### 1.21 Runtime_Tools 1.6.3

#### Fixed Bugs and Malfunctions

- This ticket includes several improvements and bugfixes to both runtime_tools and inviso. The overload mechanism can now also react to incoming messages. This is useful if an external overload watch-dog is used. Some improvements of variable bindings has been done to the default autostart mechanism - inviso_autostart_server. Autostart "jobs" can now be done in parallel, allowing for some jobs to hang waiting for some parts of the traced system to become ready before proceeding. Previously when using named meta-match-specs (tpm_ms) ending up with zero match-specs still kept the meta trace pattern active. This caused zero match-specs to be equal to unlimited meta tracing on that particular function. If the internal database becomes empty of meta match specs, meta trace pattern is removed for that function. Standard public loop data in the inviso runtime meta tracer process is now extended to a 2-tuple. The functions ctp/1 and ctpl/1 are added making it possible to remove trace patterns for a list of functions rather than one by one. Inviso_rt_meta will now accept a list of binaries to be output into the trace information file, in additions to a single binary. Further it is also possible to make own output to the trace information file using the write_ti/1 function. An error was discovered in inviso_rt making the inviso_rt_meta remain rather than terminate if the inviso_rt terminated due to "running alone" (not allowed to run without a control component). A new tool, inviso_tool, has been added to the inviso application.

  Own Id: OTP-6426

### 1.22 Runtime_Tools 1.6.2

#### Fixed Bugs and Malfunctions

- Several minor bugs and race conditions eliminated in the runtime_tools and observer applications.

  Own Id: OTP-6265

### 1.23 Runtime_Tools 1.6.1

#### Improvements and New Features

- There are new BIFs erlang:spawn_monitor/1,3, and the new option monitor for spawn_opt/2,3,4,5.

  The observer_backend module has been updated to handle the new BIFs.

  Own Id: OTP-6281

### 1.24 Runtime_Tools 1.6

Added the runtime part of the Inviso tracer, see the new Inviso application for more information. This also meant adding an application callback module and an application supervisor tree for Runtime_Tools.

### 1.25 Runtime_Tools 1.5.1.1

#### Improvements and New Features

- The dbg manual page has been updated with information about how to avoid deadlock when tracing.

  Own Id: OTP-5373 Aux Id: seq9729

### 1.26 Runtime_Tools 1.5.1

#### Fixed Bugs and Malfunctions

- Linked in drivers in the Crypto, and Asn1 applications are now compiled with the -D_THREAD_SAFE and -D_REENTRANT switches on unix when the emulator has thread support enabled.

  Linked in drivers on MacOSX are not compiled with the undocumented -lbundle1.o switch anymore. Thanks to Sean Hinde who sent us a patch.

  Linked in driver in Crypto, and port programs in SSL, now compiles on OSF1.

  Minor Makefile improvements in Runtime_Tools.

  Own Id: OTP-5346