Multi Threading scanning about pyinsane HOT 4 OPEN

Please call pyinsane2.init() only once from a single thread (for instance in your function Program()). (same goes for pyinsane2.exit()).

from pyinsane.

TestScanMultiple.txt
I moved all of the references to pyinsane2 outside of the threads but when i get to the section to start the scan in the any one of the threads:
try:
while True:
scan_session.scan.read()
except EOFError:
pass
i get another error:
===== RESTART: /home/pi/Documents/LinearBookScanner/TestScanMultiple.py =====
Device Id: 0Device Id: 1

Exiting in thread: 1Exiting in thread: 2

Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
self.run()
File "/usr/lib/python3.5/threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File "/home/pi/Documents/LinearBookScanner/TestScanMultiple.py", line 18, in Scan
scan_session.scan.read()
File "/usr/local/lib/python3.5/dist-packages/pyinsane2/sane/abstract_proc.py", line 173, in read
return remote_do('scan_read', self._scanner_name)
File "/usr/local/lib/python3.5/dist-packages/pyinsane2/sane/abstract_proc.py", line 69, in remote_do
result = os.read(fifo_s2c, length)
MemoryError
Exception in thread Thread-2:
Traceback (most recent call last):
File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
self.run()
File "/usr/lib/python3.5/threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File "/home/pi/Documents/LinearBookScanner/TestScanMultiple.py", line 18, in Scan
scan_session.scan.read()
File "/usr/local/lib/python3.5/dist-packages/pyinsane2/sane/abstract_proc.py", line 173, in read
return remote_do('scan_read', self._scanner_name)
File "/usr/local/lib/python3.5/dist-packages/pyinsane2/sane/abstract_proc.py", line 70, in remote_do
assert(len(result) == length)
AssertionError

from pyinsane.

MemoryError

How much free memory does your device has ? It seems it's running out of memory.

Unfortunately, Pyinsane uses quite a lot of memory to store the chunk of the images. In another bug report, someone reported having issues scanning at 600dpi with only 1GB of ram (raspberry pi).

from pyinsane.

I am using a pi, but I have a swap file that adds a GB so 2 in total. I am only scanning at 150 dpi so it should not be to much of a hog at that level. Was the error replicated on your machine with the script I attached in the previous comment?

from pyinsane.