vi_tools下載 - vi_tools原始碼下載

租

命令列訪問F_SETLEASE

 $ touch q
$ ./lease q rw -- sh -c 'echo Cleanup request && sleep 1 && echo Now clean'&
[1] 28330
$ echo "Before trying to access" && cat q && echo "After tying to access"
Before trying to access
Cleanup request
Now clean
[1]+  Done                    ./lease q rw -- sh -c 'echo Cleanup request && sleep 1 && echo Now clean'
After tying to access

與flock工具一樣，也可以對檔案描述符進行操作。

cgroup_內存_壓力_監視器

命令列存取控制群組記憶體壓力監控事件

 Usage: cgroup_memory_pressure_monitor {low|medium|critical} /sys/fs/cgroup/memory/your_cgroup

uksm_挑逗

使用 Ultra Kernel 同頁合併可壓縮的非零內容填入記憶體。

潤莊

適用於 Linux 的 Rundll。從庫中載入類似 main 的符號並執行它。

 $ ./runso  ./runso main  ./runso main
Usage: runso ./libsomelibrary.so main <args>

孟皮格

設定 oom_score_adj，然後用零填滿記憶體。

 $ ./mempig 
Killed

$ dmesg | grep -i oom
[228859.359178] mempig invoked oom-killer: gfp_mask=0x24280ca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), nodemask=0, order=0, oom_score_adj=1000
[228859.359234]  [<ffffffff81168397>] oom_kill_process+0x237/0x450
[228859.359372] [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds swapents oom_score_adj name
[228860.221001] oom_reaper: reaped process 27664 (mempig), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB

udp文件啄木鳥

列出 UDP 連接埠並做兩件事：

定期向指定目的地發送 UDP 封包（以保持 NAT 連線處於活動狀態）。接收方可能是 udppair（見下文）。
對於每個接收到的包含兩個數字 x 和 y 的 UDP 封包（scanf "%d%d", &x,&y），將 y 寫入檔案描述符數字 x。

也嘗試提高其調度優先權並將所有頁面鎖定到記憶體。

旨在以簡單的方式遠端控制各種 /sys/class/{brightness,gpio,pwm}/ 旋鈕。

UDP對

監聽兩個 UDP 連接埠並在它們之間交換資訊。每個回覆都會寄到最後收到的對等地址。像這樣的東西：

 socat udp-l:1234 udp-l:1235

但它不會「鎖定」某一對等點。

udp超時檢查器

透過偵測不同的延遲並測試 connectin 是否仍然有效來測量 NAT 中的 UDP 連線逾時。伺服器部分根據傳入 UDP 封包的逾時來回覆 UDP 封包。客戶端檢查不斷增加的逾時，直到偵測到遺失的回覆資料包，然後「平分」以找出更準確的關閉延遲。範圍為 2 到 512 秒。 vi-server.org:909 連接埠上可能正在執行公共伺服器。

 $ udptimeoutchecker probe 0.0.0.0 0 vi-server.org 909
Trying with timeout 1 seconds...OK
Trying with timeout 2 seconds...OK
Trying with timeout 4 seconds...OK
Trying with timeout 8 seconds...OK
Trying with timeout 16 seconds...OK
Trying with timeout 32 seconds...OK
Trying with timeout 64 seconds...OK
Trying with timeout 128 seconds...FAIL
Trying with timeout 128 seconds...FAIL
Trying with timeout 128 seconds...FAIL
Trying with timeout 96 seconds...FAIL
Trying with timeout 80 seconds...FAIL
Trying with timeout 72 seconds...FAIL
Trying with timeout 68 seconds...FAIL
Trying with timeout 66 seconds...FAIL
Intermediate result: 64
Trying with timeout 1 seconds...OK
Trying with timeout 2 seconds...OK
Trying with timeout 4 seconds...OK
Trying with timeout 8 seconds...OK
Trying with timeout 16 seconds...OK
Trying with timeout 32 seconds...OK
Trying with timeout 64 seconds...OK
Trying with timeout 128 seconds...FAIL
Trying with timeout 128 seconds...FAIL
Trying with timeout 128 seconds...FAIL
Trying with timeout 96 seconds...FAIL
Trying with timeout 80 seconds...FAIL
Trying with timeout 72 seconds...FAIL
Trying with timeout 68 seconds...FAIL
Trying with timeout 66 seconds...FAIL
Intermediate result: 64
Trying with timeout 1 seconds...OK
Trying with timeout 2 seconds...OK
Trying with timeout 4 seconds...OK
Trying with timeout 8 seconds...OK
Trying with timeout 16 seconds...OK
Trying with timeout 32 seconds...OK
Trying with timeout 64 seconds...OK
Trying with timeout 128 seconds...FAIL
Trying with timeout 128 seconds...FAIL
Trying with timeout 128 seconds...FAIL
Trying with timeout 96 seconds...FAIL
Trying with timeout 80 seconds...FAIL
Trying with timeout 72 seconds...FAIL
Trying with timeout 68 seconds...FAIL
Trying with timeout 66 seconds...FAIL
Intermediate result: 64
64

udp_ts_seq_reply

在每個 UDP 封包前面新增 12 個位元組的奈秒時間戳記（8 個位元組表示秒，4 個位元組表示奈秒）和 4 個位元組的每個客戶端序號，並將其傳回。

 $ ./udp_ts_seq_reply 0.0.0.0 1919&
$ socat -x -v - udp:127.0.0.1:1919 > /dev/null
123
> 2018/02/19 19:52:08.981246  length=4 from=0 to=3
 31 32 33 0a                                      123.
--
< 2018/02/19 19:52:08.981712  length=20 from=0 to=19
 00 00 00 00 00 57 2f 47 09 a8 bf 83 00 00 00 01  .....W/G........
 31 32 33 0a                                      123.
--
ABC
> 2018/02/19 19:52:11.439685  length=4 from=4 to=7
 41 42 43 0a                                      ABC.
--
< 2018/02/19 19:52:11.440078  length=20 from=20 to=39
 00 00 00 00 00 57 2f 49 24 fa c5 ed 00 00 00 02  .....W/I$.......
 41 42 43 0a                                      ABC.
--
DEF
> 2018/02/19 19:52:13.094035  length=4 from=8 to=11
 44 45 46 0a                                      DEF.
--
< 2018/02/19 19:52:13.094455  length=20 from=40 to=59
 00 00 00 00 00 57 2f 4b 10 61 48 68 00 00 00 03  .....W/K.aHh....
 44 45 46 0a                                      DEF.
--

轉儲_tc_統計訊息

 $ dump_tc_stats
Usage: dump_tc_stats <iface>
Dump interface statistics periodically. Don't forget to `tc qdisc add <iface> root ...` something

$ dump_tc_stats veth0
{"PACKETS":23514,"BYTES":2979825,"RATE_BPS":0,"RATE_PPS":0,"QLEN":0,"BACKLOG":0,"DROPS":0,"REQUEUES":0,"OVERLIMITS":0}
{"PACKETS":23526,"BYTES":2981342,"RATE_BPS":0,"RATE_PPS":0,"QLEN":0,"BACKLOG":0,"DROPS":0,"REQUEUES":0,"OVERLIMITS":0}
...

展開