# How to re - load all running applications from swap room right into RAM?

If my desktop lacked memory and also swaps a whole lot after that I free or eliminate the application losing my RAM. Yet, afterwards, all my desktop/applications have been exchanged and also are badly slow-moving, do you recognize a means to "unswap" (reload from swap room right into RAM) my desktop/applications?

0
2019-05-18 22:37:13
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If you actually have adequate RAM readily available once more you can utilize this series (as origin):

$swapoff -a$ swapon -a


(to compel the specific swap - in of all your applications)

(thinking that you are making use of linux)

0
2019-05-21 08:08:02
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swapon/swapoff will entirely clear your swap room, yet you can free several of it using the/ proc documents system also. You desire the first one:

# To free pagecache
echo 1 > /proc/sys/vm/drop_caches

# To free dentries and inodes
echo 2 > /proc/sys/vm/drop_caches

# To free pagecache, dentries and inodes
echo 3 > /proc/sys/vm/drop_caches

0
2019-05-21 08:03:59
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The adhering to fast - and also - unclean python manuscript unloads the memory of a procedure to stdout. This has the negative effects of filling any kind of exchanged out web page or mapped documents. Call it as cat_proc_mem 123 456 789 where the debates are procedure IDs.

This manuscript is entirely details to Linux. It may be versatile to various other systems with a comparable /proc framework (Solaris?), yet forget running it on as an example *BSD. Also on Linux, you might require to transform the definition of c_pid_t and also the values of PTRACE_ATTACH and also PTRACE_DETACH. This is an evidence - of - concept manuscript, not suggested as an instance of excellent shows techniques. Usage at your very own threat.

Linux makes the memory of a procedure readily available as /proc/$pid/mem. Just particular address arrays are legible. These arrays can be located by reviewing the memory mapping details from the message documents /proc/$pid/maps. The pseudo - documents /proc/$pid/mem can not read by all procedures that have the approval to read it: the viewers procedure have to have called ptrace(PTRACE_ATTACH,$pid).

#!/usr/bin/env python
import ctypes, re, sys

## Partial interface to ptrace(2), only for PTRACE_ATTACH and PTRACE_DETACH.
c_ptrace = ctypes.CDLL("libc.so.6").ptrace
c_pid_t = ctypes.c_int32 # This assumes pid_t is int32_t
c_ptrace.argtypes = [ctypes.c_int, c_pid_t, ctypes.c_void_p, ctypes.c_void_p]
def ptrace(attach, pid):
op = ctypes.c_int(16 if attach else 17) #PTRACE_ATTACH or PTRACE_DETACH
c_pid = c_pid_t(pid)
null = ctypes.c_void_p()
err = c_ptrace(op, c_pid, null, null)
if err != 0: raise SysError, 'ptrace', err

## Parse a line in /proc/$pid/maps. Return the boundaries of the chunk ## the read permission character. def maps_line_range(line): m = re.match(r'([0-9A-Fa-f]+)-([0-9A-Fa-f]+) ([-r])', line) return [int(m.group(1), 16), int(m.group(2), 16), m.group(3)] ## Dump the readable chunks of memory mapped by a process def cat_proc_mem(pid): ## Apparently we need to ptrace(PTRACE_ATTACH,$pid) to read /proc/\$pid/mem
ptrace(True, int(pid))
maps_file = open("/proc/" + pid + "/maps", 'r')
maps_file.close()
mem_file = open("/proc/" + pid + "/mem", 'r', 0)
for r in ranges:
if r[2] == 'r':
mem_file.seek(r[0])
print chunk,
mem_file.close()
## Cleanup
ptrace(False, int(pid))

if __name__ == "__main__":
for pid in sys.argv[1:]:
cat_proc_mem(pid)


unswap () {