python - GAE - Upload optimized image to cloud storage -

i'm working on simple app takes images optimizes them , saves them in cloud storage. found example takes file , uses pil optimize it. code looks this:

def inplaceoptimizeimage(photo_blob):         blob_key = photo_blob.key()         new_blob_key = none          img = image.open(photo_blob.open())         output = stringio.stringio()         img.save(output,img.format, optimized=true,quality=90)         opt_img = output.getvalue()         output.close()          # create file         file_name = files.blobstore.create(mime_type=photo_blob.content_type)          # open file , write         files.open(file_name, 'a') f:             f.write(opt_img)          # finalize file. before attempting read it.         files.finalize(file_name)          # file's blob key         return files.blobstore.get_blob_key(file_name) 

this works fine locally (although don't know how it's being optimized because when run uploaded image through http://www.jpegmini.com/ gets reduced 2.4x still). when deploy app , try uploading images 500 errors , these messages in logs:

f 00:30:33.322 exceeded soft private memory limit of 128 mb 156 mb after servicing 7 requests total w 00:30:33.322 while handling request, process handled request found using memory , terminated. cause new process used next request application. if see message frequently, may have memory leak in application. 

i have 2 questions:

1. is best way optimize , save images in cloud storage?
2. how prevent these 500 errors occurring?

thanks in advance.

the error you're experiencing happening due memory limits of instance class.

what suggest edit .yaml file in order configure module, , specify instance class f2 or higher. in case not using modules, should add “module: default” @ beginning of app.yaml file let gae know default module.

you can take article docs see different instance classes available, , way configure them.

another more basic workaround limit image size when uploading it, finish having similar issue.

regarding previous matter , way optimize images, may want take @ app engine images api provides ability manipulate image data using dedicated images service. in case, might "i'm feeling lucky" transformation. using api might not need update instance class.