linux-mem
linux-mem copied to clipboard
tatref
Linux memory tools
Linux memory tools
A toolbox to inspect Linux memory
https://github.com/tatref/linux-mem
Main tools
snap.py
/proc snapshot tool
memstats
Memory usage for groups of processes. Main target is Oracle databases
┌─────────────────┬───────┬────────────┬────────────┬────────────┬───────────┬──────────┬──────────┬─────────────┬──────────┐
│ group_name │ procs │ mem_rss │ mem_anon │ mem_uss │ swap_anon │ swap_rss │ swap_uss │ shm_mem │ shm_swap │
├─────────────────┼───────┼────────────┼────────────┼────────────┼───────────┼──────────┼──────────┼─────────────┼──────────┤
│ Some("+ASM1") │ 102 │ 5209.41 MB │ 4636.65 MB │ 5179.87 MB │ 0 MB │ 0 MB │ 0 MB │ 3213.41 MB │ 0 MB │
│ None │ 74 │ 3790.02 MB │ 3536.86 MB │ 3765.41 MB │ 0.01 MB │ 0.01 MB │ 0.01 MB │ 0 MB │ 0 MB │
│ Some("DBB1") │ 109 │ 2357.09 MB │ 1489.36 MB │ 2216.93 MB │ 0 MB │ 0 MB │ 0 MB │ 21479.03 MB │ 0 MB │
│ Some("DBD1") │ 90 │ 1614.49 MB │ 1101.75 MB │ 1470.30 MB │ 0 MB │ 0 MB │ 0 MB │ 4299.16 MB │ 0 MB │
└─────────────────┴───────┴────────────┴────────────┴────────────┴───────────┴──────────┴──────────┴─────────────┴──────────┘
kpageflags
Live visual map of physical memory with client/server modes
Usage
Local usage
sudo ./target/release/kpageflags-viewer
Server usage
sudo ./target/release/kpageflags-viewer server 192.168.0.1:10000
Client usage
./target/release/kpageflags-viewer client 192.168.0.1:10000
Building
Cross compiling to Windows (client only)
cargo install cross # requires podman/docker
cross b --release --target x86_64-pc-windows-gnu --bin kpageflags-viewer
processes2png
Visual map of processes memory
For details, see my blog post
Effect of memory compaction:
Small tools
procinfo
Memory map details for single process. List virtual memory, physical pages, physical flags...
Information is grabbed from /proc/<pid>/smaps, /proc/<pid>/pagemap, /proc/kpageflags
Usage: procinfo <pid...>
# procinfo 12345
0x00007ff437847000-0x00007ff437849000 MMPermissions(NONE | READ | WRITE | PRIVATE) 0 Anonymous
PFN=0x0000159f83 MemoryPageFlags(SOFT_DIRTY | PRESENT | 0x159f83) / Some(PhysicalPageFlags(UPTODATE | LRU | MMAP | ANON | SWAPBACKED))
PFN=0x000010a5cb MemoryPageFlags(SOFT_DIRTY | PRESENT | 0x10a5cb) / Some(PhysicalPageFlags(UPTODATE | LRU | MMAP | ANON | SWAPBACKED))
stats: VSZ=8 kiB, RSS=8 kiB, SWAP=0 kiB
0x00007ff43784d000-0x00007ff437854000 MMPermissions(NONE | READ | SHARED) 160259 Path("/usr/lib64/gconv/gconv-modules.cache")
PFN=0x0000109d63 MemoryPageFlags(SOFT_DIRTY | FILE | PRESENT | 0x109d63) / Some(PhysicalPageFlags(REFERENCED | UPTODATE | LRU | ACTIVE | MMAP))
PFN=0x0000109d5b MemoryPageFlags(SOFT_DIRTY | FILE | PRESENT | 0x109d5b) / Some(PhysicalPageFlags(REFERENCED | UPTODATE | LRU | ACTIVE | MMAP))
shmat
Attach shared memory segments to current process
shmem
Shared memory tool
connections
Establish lots of connections to Oracle database
find_instances
Find Oracle database instances, connect to DB and run some request. Env variables (SID, lib...) and user are found automatically.
tatref