NAME

       pypy - fast, compliant alternative implementation of the Python language

SYNOPSIS

       pypy [options] [-c cmd|-m mod|file.py|-] [arg...]

OPTIONS

       -i     Inspect interactively after running script.

       -O     Skip assert statements.

       -OO    Remove docstrings when importing modules in addition to -O.

       -c cmd Program passed in as CMD (terminates option list).

       -S     Do not import site on initialization.

       -s     Don't add the user site directory to sys.path.

       -u     Unbuffered binary stdout and stderr.

       -h, --help
              Show a help message and exit.

       -m mod Library module to be run as a script (terminates option list).

       -W arg Warning control (arg is action:message:category:module:lineno).

       -E     Ignore environment variables (such as PYTHONPATH).

       -B     Disable writing bytecode (.pyc) files.

       --version
              Print the PyPy version.

       --info Print translation information about this PyPy executable.

       --jit arg
              Low level JIT parameters. Format is arg=value[,arg=value...]

              off    Disable the JIT.

              threshold=value
                     Number of times a loop has to run for it to become hot.

              function_threshold=value
                     Number of times a function must run for it to become traced from start.

              inlining=value
                     Inline python functions or not (1/0).

              loop_longevity=value
                     A parameter controlling how long loops will be kept before being freed, an estimate.

              max_retrace_guards=value
                     Number of extra guards a retrace can cause.

              retrace_limit=value
                     How many times we can try retracing before giving up.

              trace_eagerness=value
                     Number of times a guard has to fail before we start compiling a bridge.

              trace_limit=value
                     Number of recorded operations before we abort tracing with ABORT_TRACE_TOO_LONG.

              enable_opts=value
                     Optimizations to enabled or all.  Warning, this option is dangerous, and should be avoided.

ENVIRONMENT

       PYTHONPATH
              Add directories to pypy's module search path.  The format is the same as shell's PATH.

       PYTHONSTARTUP
              A  script  referenced  by  this variable will be executed before the first prompt is displayed, in
              interactive mode.

       PYTHONDONTWRITEBYTECODE
              If set to a non-empty value, equivalent to the -B option.  Disable writing .pyc files.

       PYTHONINSPECT
              If set to a non-empty value, equivalent to the -i option.  Inspect interactively after running the
              specified script.

       PYTHONIOENCODING
              If this  is  set,  it  overrides  the  encoding  used  for  stdin/stdout/stderr.   The  syntax  is
              encodingname:errorhandler  The  errorhandler  part  is  optional  and  has  the same meaning as in
              str.encode.

       PYTHONNOUSERSITE
              If set to a non-empty value, equivalent to the -s option.  Don't add the user  site  directory  to
              sys.path.

       PYTHONWARNINGS
              If set, equivalent to the -W option (warning control).  The value should be a comma-separated list
              of -W parameters.

       PYPYLOG
              If set to a non-empty value, enable logging, the format is:

              fname  logging  for profiling: includes all debug_start/debug_stop but not any nested debug_print.
                     fname can be - to log to stderr.

              :fname Full logging, including debug_print.

              prefix:fname
                     Conditional logging.  Multiple prefixes can be specified, comma-separated.   Only  sections
                     whose name match the prefix will be logged.

              PYPYLOG=jit-log-opt,jit-backend:logfile  will  generate  a  log suitable for jitviewer, a tool for
              debugging performance issues under PyPy.

       PyPy's default minimark garbage collector is configurable through several environment variables:

       PYPY_GC_NURSERY
              The nursery size.  Defaults to 1/2 of your cache or 4M.  Small values (like 1 or 1KB)  are  useful
              for debugging.

       PYPY_GC_MAJOR_COLLECT
              Major  collection memory factor.  Default is 1.82, which means trigger a major collection when the
              memory consumed equals 1.82 times the memory  really  used  at  the  end  of  the  previous  major
              collection.

       PYPY_GC_GROWTH
              Major  collection threshold's max growth rate.  Default is 1.4.  Useful to collect more often than
              normally on sudden memory growth, e.g. when there is a temporary peak in memory usage.

       PYPY_GC_MAX
              The max heap size.  If coming near this limit, it will first collect more  often,  then  raise  an
              RPython  MemoryError, and if that is not enough, crash the program with a fatal error.  Try values
              like 1.6GB.

       PYPY_GC_MAX_DELTA
              The major collection threshold will never be set to more than PYPY_GC_MAX_DELTA the amount  really
              used  after  a collection.  Defaults to 1/8th of the total RAM size (which is constrained to be at
              most 2/3/4GB on 32-bit systems).  Try values like 200MB.

       PYPY_GC_MIN
              Don't collect while the memory size is below this limit.  Useful to avoid spending all the time in
              the GC in very small programs.  Defaults to 8 times the nursery.

       PYPY_GC_DEBUG
              Enable extra checks around collections that are too slow for normal use.  Values are  0  (off),  1
              (on major collections) or 2 (also on minor collections).

SEE ALSO

       python(1)

AUTHOR

       The PyPy Project

COPYRIGHT

       2013, The PyPy Project

2.2                                            September 30, 2015                                        PYPY(1)