Module: GC::OOB

Defined in:
lib/gctools/oobgc/unicorn_middleware.rb,
ext/oobgc/oobgc.c

Defined Under Namespace

Modules: UnicornMiddleware

Class Method Summary collapse

Class Method Details

.clear ⇒ Object 



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# File 'ext/oobgc/oobgc.c', line 177

static VALUE
oobgc_clear(VALUE self)
{
  MEMZERO(&_oobgc.stat, _oobgc.stat, 1);
  return Qnil;
}

.run ⇒ Object 



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# File 'ext/oobgc/oobgc.c', line 107

static VALUE
oobgc(VALUE self)
{
  size_t curr = rb_gc_stat(sym_total_allocated_objects);
  if (!_oobgc.installed) install();

  if (!_oobgc.prev_allocated_object) {
    _oobgc.prev_allocated_object = curr;
  } else {
    size_t diff = curr - _oobgc.prev_allocated_object;
    _oobgc.prev_allocated_object = curr;

    if (_oobgc.threshold.mean)
      _oobgc.threshold.mean = (diff / 4) + (_oobgc.threshold.mean * 3 / 4);
    else
      _oobgc.threshold.mean = diff;

    if (diff > _oobgc.threshold.max)
      _oobgc.threshold.max = diff;
    if (_oobgc.threshold.max > 200000)
      _oobgc.threshold.max = 200000;
  }

  if (_oobgc.sweep_needed) {
    /* lazy sweep started sometime recently.
     * disable/enable the GC to force gc_rest_sweep() OOB
     */
    if (rb_gc_disable() == Qfalse) rb_gc_enable();
    _oobgc.stat.sweep++;
    return Qtrue;

  } else if (_oobgc.allocation_limit) {
    /* GC will be required when total_allocated_objects gets
     * close to allocation_limit
     */
    if ((rb_gc_stat(sym_old_objects) >= rb_gc_stat(sym_old_objects_limit)*0.97 ||
        rb_gc_stat(sym_remembered_wb_unprotected_objects) >= rb_gc_stat(sym_remembered_wb_unprotected_objects_limit)*0.97) &&
        curr >= _oobgc.allocation_limit - _oobgc.threshold.max*0.98) {
      /*fprintf(stderr, "oobgc MAJOR: %zu >= %zu - %zu\n", curr, _oobgc.allocation_limit, _oobgc.threshold.max);*/
      gc_start_major();
      return Qtrue;

    } else if (curr >= _oobgc.allocation_limit - _oobgc.threshold.mean) {
      /*fprintf(stderr, "oobgc minor: %zu >= %zu - %zu\n", curr, _oobgc.allocation_limit, _oobgc.threshold.mean);*/
      gc_start_minor();
      return Qtrue;
    }
  }

  return Qfalse;
}

.setup ⇒ Object 



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# File 'ext/oobgc/oobgc.c', line 68

static VALUE
install()
{
  rb_event_flag_t events =
    RUBY_INTERNAL_EVENT_GC_START    |
    RUBY_INTERNAL_EVENT_GC_END_MARK |
    RUBY_INTERNAL_EVENT_GC_END_SWEEP;

  if (_oobgc.installed)
    return Qfalse;

  if (!_oobgc.tpval) {
    _oobgc.tpval = rb_tracepoint_new(0, events, gc_event_i, (void *)0);
    rb_ivar_set(mOOB, rb_intern("tpval"), _oobgc.tpval);
  }

  rb_tracepoint_enable(_oobgc.tpval);
  _oobgc.installed = 1;
  return Qtrue;
}

.stat(key) ⇒ Object 



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# File 'ext/oobgc/oobgc.c', line 159

static VALUE
oobgc_stat(VALUE self, VALUE key)
{
  if (!_oobgc.installed)
    return Qnil;

  if (key == sym_count)
    return SIZET2NUM(_oobgc.stat.major + _oobgc.stat.minor + _oobgc.stat.sweep);
  else if (key == sym_major_count)
    return SIZET2NUM(_oobgc.stat.major);
  else if (key == sym_minor_count)
    return SIZET2NUM(_oobgc.stat.minor);
  else if (key == sym_sweep_count)
    return SIZET2NUM(_oobgc.stat.sweep);
  else
    return Qnil;
}