Go1.3 本体のソースでゴルーチンを起動している箇所数

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 143 runtime/race/testdata/mop_test.go
  50 runtime/race/testdata/chan_test.go
  41 runtime/race/testdata/slice_test.go
  27 runtime/race/testdata/waitgroup_test.go
  25 net/http/serve_test.go
  22 runtime/chan_test.go
  21 runtime/race/testdata/atomic_test.go
  21 net/timeout_test.go
  19 runtime/race/testdata/map_test.go
  18 runtime/proc_test.go
  15 net/http/transport_test.go
  14 runtime/race/testdata/select_test.go
  14 runtime/race/testdata/comp_test.go
  14 net/tcp_test.go
  13 runtime/race/testdata/sync_test.go
  12 runtime/race/testdata/rwmutex_test.go
  12 runtime/race/testdata/mutex_test.go
  10 runtime/stack_test.go
   9 io/pipe_test.go
   8 runtime/pprof/pprof_test.go
   8 net/rpc/jsonrpc/all_test.go
   8 net/net_test.go
   7 sync/cond_test.go
   7 sync/atomic/atomic_test.go
   7 runtime/crash_test.go
   7 crypto/tls/handshake_server_test.go
   6 sync/rwmutex_test.go
   6 net/http/transport.go
   6 net/dial_test.go
   6 log/syslog/syslog_test.go
   6 database/sql/sql_test.go
   5 time/sleep_test.go
   5 os/exec/exec_test.go
   5 net/rpc/server_test.go
   4 sync/mutex_test.go
   4 runtime/race/testdata/regression_test.go
   4 runtime/race/output_test.go
   4 net/server_test.go
   4 net/pipe_test.go
   3 sync/waitgroup_test.go
   3 strings/reader_test.go
   3 runtime/race/testdata/finalizer_test.go
   3 runtime/map_test.go
   3 runtime/crash_cgo_test.go
   3 net/unix_test.go
   3 net/rpc/server.go
   3 net/lookup_windows.go
   3 net/http/server.go
   3 bytes/reader_test.go
   2 testing/testing.go
   2 testing/benchmark.go
   2 sync/example_test.go
   2 runtime/race/testdata/io_test.go
   2 runtime/mfinal_test.go
   2 runtime/malloc_test.go
   2 reflect/all_test.go
   2 os/signal/signal_test.go
   2 net/smtp/smtp_test.go
   2 net/http/httptest/server.go
   2 net/http/fcgi/child.go
   2 net/fd_windows.go
   2 net/fd_mutex_test.go
   2 mime/multipart/quotedprintable_test.go
   2 go/printer/printer_test.go
   2 go/doc/testdata/testing.go
   2 crypto/tls/tls_test.go
   1 time/time_test.go
   1 time/sleep.go
   1 text/template/parse/lex.go
   1 text/template/exec_test.go
   1 testing/example.go
   1 syscall/net_nacl.go
   1 syscall/exec_plan9.go
   1 sync/runtime_sema_test.go
   1 sync/pool_test.go
   1 sync/once_test.go
   1 runtime/syscall_windows_test.go
   1 runtime/symtab_test.go
   1 runtime/runtime_unix_test.go
   1 runtime/race/testdata/cgo_test_main.go
   1 runtime/pprof/pprof.go
   1 runtime/parfor_test.go
   1 runtime/lfstack_test.go
   1 runtime/gc_test.go
   1 runtime/futex_test.go
   1 os/signal/signal_windows_test.go
   1 os/signal/signal_unix.go
   1 os/os_test.go
   1 os/exec/exec.go
   1 net/z_last_test.go
   1 net/rpc/client.go
   1 net/protoconn_test.go
   1 net/net_windows_test.go
   1 net/net.go
   1 net/mockserver_test.go
   1 net/lookup.go
   1 net/http/triv.go
   1 net/http/httputil/reverseproxy.go
   1 net/http/httputil/dump.go
   1 net/http/fs.go
   1 net/http/filetransport.go
   1 net/http/client_test.go
   1 net/http/cgi/matryoshka_test.go
   1 net/example_test.go
   1 net/dnsname_test.go
   1 net/dnsclient_unix.go
   1 net/dial_gen.go
   1 net/dial.go
   1 net/conn_test.go
   1 math/big/nat_test.go
   1 image/png/reader_test.go
   1 go/token/position_test.go
   1 go/parser/short_test.go
   1 go/doc/testdata/example.go
   1 go/doc/testdata/benchmark.go
   1 encoding/json/stream_test.go
   1 encoding/gob/type_test.go
   1 encoding/base64/base64_test.go
   1 database/sql/sql.go
   1 crypto/tls/tls.go
   1 crypto/tls/handshake_client_test.go
   1 crypto/rsa/pss_test.go
   1 compress/zlib/writer_test.go
   1 compress/lzw/writer_test.go
   1 compress/gzip/gunzip_test.go
   1 bufio/bufio_test.go
   1 archive/zip/reader_test.go

コマンド（たぶん過不足無いはず）

$ grep -n "\sgo .*(" **/*.go | grep -v "[0-9]:\s*//" | awk -F":" '{print $1}' | sort | uniq -c | sort -r