Memory leak with libvips 8.9

I have a very simple code:

import pyvips
im = pyvips.Image.new_from_file('../imgs/anoir-chafik-37957.jpg')
while True:
    im.shrink(16, 16).write_to_file('_vips.16x.png')

It constantly consuming more and more memory until it hangs up.

[jcupitt]

On each iteration, the old im is freed so memory shouldn't grow even without the fix, but it does.

That’s the libvips operation cache. It’ll keep the decoded image around in case it is needed again.

Try this:

for i in range(10000):
    print(f"loop {i} ..")
    im = pyvips.Image.new_from_file(sys.argv[1], access="sequential")
    im.shrink(16, 16).write_to_file(sys.argv[2])

The sequential tag will prevent the image being cached and it’ll be unreffed and decoded again each time. You shouldn’t see memory growth, even without that patch.

[jcupitt]

This is all released now, so I’ll close.