Re: need some advice on how to do this

[Libman]

I couldn't reproduce the problem, neither on nim v0.19.0 release nor today's 
#devel, running under Ubuntu 18-10.

For my test I created two basic download loop daemons:

**dlHttpClient.nim** using Nim stdlib as above -
    
    
    import os, times, httpClient
    
    var client = newHttpClient()
    let outName = getAppFilename() & ".out"
    const grabUrl = "http://speedtest.ftp.otenet.gr/files/test1Mb.db";
    
    while true:
      echo "Fetching " & grabUrl & " ..."
      var startTime = cpuTime()
      client.downloadFile grabUrl, outName
      var workSec = (cpuTime() - startTime) * 1000
      echo "... finished in " & $workSec & " sec\n"
      sleep 10*1000
    
    
    Run

**dlCurl.nim** using libcurl -
    
    
    import os, times, libCurl
    
    var outFile: File
    let outName = getAppFilename() & ".out"
    const grabUrl = "http://speedtest.ftp.otenet.gr/files/test1Mb.db";
    
    proc checkCurl(code: Code) =
      if code != E_OK:
        raise newException(AssertionError, "CURL failed: " & 
$easy_strerror(code))
    
    while true:
      echo "Fetching " & grabUrl & " ..."
      var startTime = cpuTime()
      var curl = libCurl.easy_init()
      discard outFile.open(outName, fmWrite)
      checkCurl curl.easySetOpt(OPT_URL, grabUrl)
      checkCurl curl.easySetOpt(OPT_FOLLOWLOCATION, 1)
      checkCurl curl.easySetOpt(OPT_WRITEDATA, outFile)
      checkCurl curl.easyPerform()
      curl.easyCleanup()
      outFile.close()
      var workSec = (cpuTime() - startTime) * 1000
      echo "... finished in " & $workSec & " sec\n"
      sleep 10*1000
    
    
    Run

After looping for a while, both used a reasonable and stable amount of memory, 
with the curl version using a little bit more. Pasting from `top`:

  * dlHttpClient (virt=6220, **res=4104** , shr=2476)
  * dlCurl (virt=137708 **res=9624** shr=8256)



Replacing "1Mb" with "1Gb" 
([etc](https://androidtipszoneapk.blogspot.com/2015/04/download-test-files-100kb-1mb-10mb.html))
 in `grabUrl`, memory usage remains reasonable.