esproul

/* MMAP testing utility
 *
 * Build: gcc -o mmap_test mmap_test.c
 *
 * Create the test files:
 *   mkdir test_data
 *   for i in {1..1000} ; do \
 *     head -c 1000000 < /dev/urandom > test_data/test_data${i}.bin
 *   done
 *

esproul

# /usr/gnu/bin/du -hs  .
34M     .

# /usr/gnu/bin/du -hs --apparent-size .
44K     .

# WAT??

# ls -ldi .
44954 drwxr-x--- 2 root root 9 Sep  6 15:50 .

esproul

/* Usage: dtrace -s watch-slabs.d <pool-name> */

#pragma D option quiet

fbt::metaslab_load:entry
/args[0]->ms_group->mg_vd->vdev_spa->spa_name == $$1/
{
  self->loading = 1;
  self->slab_id = args[0]->ms_id;
  self->tlvdev_type = stringof(args[0]->ms_group->mg_vd->vdev_ops->vdev_op_type);

esproul

<spa_t>::walk metaslab | ::printf "tl-vdev_id: %d slab: %d loaded: %d\n" metaslab_t ms_group->mg_vd->vdev_id ms_id ms_loaded !grep "loaded: 1"

esproul

debug: 
debug: Solaris Linkers: 5.11-1.1749 (illumos)
debug: 
debug: arg[1]   option=-D:  option-argument: args
debug: arg[2]   option=-R:  option-argument: /opt/circonus/lib
debug: arg[4]   option=-R:  option-argument: /opt/local/lib/
debug: arg[5]   option=-Y:  option-argument: P,/lib/amd64:/usr/lib/amd64:/opt/local/lib/
debug: arg[7]   option=-Q:  option-argument: y
debug: arg[8]   option=-o:  option-argument: conftest
debug: arg[14]  option=-L:  option-argument: /opt/circonus/lib

esproul

$ elfdump -d /opt/local/lib/libxslt.so.1.1.28 

Dynamic Section:  .dynamic
     index  tag                value
       [0]  NEEDED            0x2dc1              libxml2.so.2
       [1]  NEEDED            0x2dce              liblzma.so.5
       [2]  NEEDED            0x2ddb              libz.so.1
       [3]  NEEDED            0x2de5              libpthread.so.1
       [4]  NEEDED            0x2d7a              librt.so.1
       [5]  NEEDED            0x2df5              libiconv.so.2

esproul

debug: 
debug: Solaris Linkers: 5.11-1.1749 (illumos)
debug: 
debug:  search path=/lib/amd64:/usr/lib/amd64:/opt/local/lib/  (LIBPATH or -YP)
debug: Library Search Paths (initial)
debug:   /lib/amd64
debug:   /usr/lib/amd64
debug:   /opt/local/lib/
debug: 
debug: Library Search Paths (-L updated)

esproul

(gdb) bt
#0  BaseLogFile::roll (this=0x57f7550, interval_start=<optimized out>, interval_end=<optimized out>) at BaseLogFile.cc:119
#1  0x00000000006ebee0 in LogObjectManager::_solve_filename_conflicts (this=this@entry=0x36b9df8, log_object=log_object@entry=0xf17a90, 
    maxConflicts=maxConflicts@entry=99) at LogObject.cc:1029
#2  0x00000000006ec619 in LogObjectManager::_manage_object (this=0x36b9df8, log_object=0xf17a90, is_api_object=false, maxConflicts=99)
    at LogObject.cc:894
#3  0x00000000006db8db in manage_object (maxConflicts=99, logObject=0xf17a90, this=0x36b9df8) at LogObject.h:394
#4  LogConfig::read_xml_log_config (this=this@entry=0x36b9dd0) at LogConfig.cc:1468
#5  0x00000000006dda70 in setup_log_objects (this=0x36b9dd0) at LogConfig.cc:503
#6  LogConfig::init (this=0x36b9dd0, prev_config=0x0) at LogConfig.cc:388

esproul

(gdb) break BaseLogFile::roll
Function "BaseLogFile::roll" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (BaseLogFile::roll) pending.
(gdb) run
Starting program: /opt/circonus/bin/traffic_server 
warning: Cannot initialize thread debugging library: Debugger service failed
warning: Cannot initialize thread debugging library: Debugger service failed
warning: Cannot initialize thread debugging library: Debugger service failed
traffic_server: using root directory '/opt/circonus'

esproul

$ sudo dtrace -lvn 'fqd::client-connect'
   ID   PROVIDER            MODULE                          FUNCTION NAME
65814    fq33268               fqd                      conn_handler client-connect

        Probe Description Attributes
                Identifier Names: Private
                Data Semantics:   Private
                Dependency Class: Unknown

        Argument Attributes