node.js - Low download speed -


hey guys having big problem , need advice .

i have dedicated server informations :

  • atom c2750 8/8t 2,4 / 2,6 ghz
  • 16 gb ram ddr3 1600mhz
  • 12tb
  • 500mbps bandwidth
  • list item
  • 1gbps network burst

i running website using nodejs users can download high volume files .

the website evolved rapidly , having 10k users per day , average of 1k concurrent users (downloads).

the problem server getting lower , lower download speed on client's side have added throttle downloads 800kb/s , did bit problem remains same should ?

thanks

you have figure out worst bottleneck is. have design measurements , tests , maybe calculations determine bottleneck is.

here possibilities:

  1. total server bandwidth on server ethernet connection internet. if have 1k users trying download , have 500mbps total bandwidth, you're going 0.5mbps or 500kbps per user. @ point, need either shrink data, reduce number of users or increase server bandwidth.

  2. server cpu. should easy detect. check cpu utilization. if node.js process using 100% of cpu, cpu bound , either need faster computer or if have multi-cpu processor, can cluster server on same host more cpus working you. if don't have multi-cpu process, 1 or cluster across multiple servers (the idea need more cpus). though have no idea if cpu bound (i suspect you're more bandwidth bound), atom c2750 has 8 cores clustering, each core not particularly fast compared other intel cpus.

  3. network card. it's possible network card holding , not saturating bandwidth. example, if had 100mbps network connection server, that's max bandwidth can use. if think should have 1gbps network connection server, need make sure getting fast link.

fyi, 1gbps network burst doesn't if have lots of users downloading stuff on longer period of time. useful sudden , short peak of activity, not continuous high load.


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

jquery - Responsive Navbar with Sub Navbar -

good day, forgive me nav vocabulary not best. if question confusing apologize. i'm working on navigation bar needs centered on page @ 768px , above. items in nav open (or perhaps toggle) subnav lives directly below. these nav should appear centered on page. i have been able work through responsive portion of nav bar, having main items align vertically , sub nav menu of each item roll out below, , gave them indent separation. working well. however, issue not responsive side, behavior @ width greater 768px. happens toggling menu's sub navigation pushes other main items down page below sub nav. here's code: $(document).ready(function () { //stick in fixed 100% height behind navbar don't wrap $('#slide-nav.navbar-inverse').after($('<div class="inverse" id="navbar-height-col"></div>')); $('#slide-nav.navbar-default').after($('<div id="navbar-height-col"></d
Read more