apache - Server lagging - Django + mongodb + cronjob -

i'm deploying django application, i'm using apache deployement module wgsi , mongodb database.

i got multiple cronjob called every 10min collect data many api (using django-kronos).

when server launch every thing great after few hours server start lagging , down. 100% of cpu used. here:

this 1 of crontask:

@kronos.register('*/10+2 * * * *') def update_mongo():   # init instagram api   api = instagramapi(client_id = 'social_auth_instagram_key',     client_secret = 'social_auth_instagram_secret')    # last post added in database   try:     last_id = post.objects(keywords = 'news').order_by('-created_at').limit(1)[0].insta_id   except:     last_id = 0    # last media tagged news   if last_id != 0:     results = api.tag_recent_media(tag_name = 'news', min_tag_id = last_id)   else:     results = api.tag_recent_media(tag_name = 'news')    result in results:     # if post doesn't exist, create new 1     try:       post = post.objects.get(insta_id = result.id)     except:       post = instapost()      # init post , save in database     post.save(result) 

the problem if don't know problem, apache + django ? or line post = post.objects.get(insta_id = result.id) ?

edit

i removed cronjob , same problem, after while physical memory , cpu explosed , server start lagging hard.

the server staging 1 bad 1 : 1 core, 992 mb ram

your charts show memory, disk , cpu activity around time application slows down. because of memory consumption inside application. when application hits memory limit start swapping disk. post chart of swapfile usage?