 testName = "Seek";
 testDescription = "Seek test performs " + QString::number(SEEKER_SEEKCOUNT) +
   " seeks to random positions on device." +
   " Seek lenght is marked on horizontal axis and seek duration is on vertical axis.";
}

Seeker::~Seeker() {}

void Seeker::TestLoop() {
 // erease previous results
 result.erase();
 
 // initialize random number generator
 RandomGenerator gen;
 
 // seek to drive end
 hddsize last = device->GetSize();
 device->SeekTo(last);
 
 // test SEEKER_SEEKCOUNT seeks
 for(int i = 0; i < SEEKER_SEEKCOUNT; ++i) {
  hddsize next = gen.Get64() % device->GetSize();	// get next position
  
  // make timed seek
  hddtime timediff = device->SeekTo(next);
  
  // count seek length
  uint64_t posdiff;
  if(last > next)
   posdiff = last - next;
  else
   posdiff = next - last;
  
  // set last position for next test
  last = next;
  
  qreal pos = (qreal)posdiff / (qreal)device->GetSize();	// calculate pos relative to drivesize
  qreal time = (qreal)timediff / 1000.0;			// evaluate seek time in miliseconds
  
  result.AddSeek(QPointF(pos, time));	// add seek to results
  
  // count test progress
  result.progress = i * 100 / (SEEKER_SEEKCOUNT - 1);
  
  if(testState == STOPPING) {
   return; 
}

void Seeker::InitScene() {
 // clear ticks
 dataTicks->erase();
}
void Seeker::UpdateScene() {
 // draw new seeks
 while(!result.newseeks.empty()) {
  QPointF seek = result.newseeks.pop();
  
  // mark seek as important if it is close to average
  if(seek.ry() < SEEKER_IMPORTANT * result.avg()) {
   dataTicks->AddTick(seek.y(), seek.x(), true);
  } else {
   dataTicks->AddTick(seek.y(), seek.x(), false);
  }
 }
 
 // draw new reference seeks
 while(!reference.newseeks.empty()) {
  QPointF seek = reference.newseeks.pop();
  
  // mark seek as important if it is close to average
  if(seek.ry() < SEEKER_IMPORTANT * reference.avg()) {
   referenceTicks->AddTick(seek.y(), seek.x(), true);
  } else {
   referenceTicks->AddTick(seek.y(), seek.x(), false);
  }
 }
 
 // update lines
 dataAvgLine->SetValue(result.avg());
 referenceAvgLine->SetValue(reference.avg());
 
 // rescale view
 Rescale();
}

int Seeker::GetProgress() {
 return result.progress;
}

void Seeker::SeekResult::AddSeek(QPointF seek) {
 // count new average seek
 average = ((qreal)seeks.count() * average + seek.y()) / (seeks.count() + 1);
 
 seeks.push_back(seek);		// add seek to result seek list
 newseeks.push_back(seek);	// add sekk to stack used for drawing new results
}

qreal Seeker::SeekResult::avg() {
 return average;
}

void Seeker::SeekResult::erase() {
 seeks.erase(seeks.begin(), seeks.end());
 newseeks.erase(newseeks.begin(), newseeks.end());
 progress = 0.0f;
 average = 0.0f;
}

QDomElement Seeker::WriteResults(QDomDocument &doc) {
 // create main seek element
 QDomElement master = doc.createElement("Seeker");
 master.setAttribute("valid", (GetProgress() == 100)?"yes":"no");
 doc.appendChild(master);
 
 // add values to main element
 if(GetProgress() == 100) for(int i = 0; i < result.seeks.size(); ++i) {
  QDomElement value = doc.createElement("Seek");
  value.setAttribute("length", result.seeks[i].x());
  value.setAttribute("time", result.seeks[i].y());
  master.appendChild(value);
 }
 
 return master;
}

void Seeker::RestoreResults(QDomElement &results, DataSet dataset) {
 SeekResult &result = (dataset == REFERENCE)?this->reference:this->result;
 
 // Locate main seek element
 QDomElement seek = results.firstChildElement("Seeker");
 if(!seek.attribute("valid", "no").compare("no")) {
  return;
 }
 
 // clear results and initialize scene
 result.erase();
 (dataset == REFERENCE)?referenceTicks->erase():dataTicks->erase();
 
 // get list of seeks
 QDomNodeList seeks = seek.elementsByTagName("Seek");
 
 // read result data
 for(int i = 0; i < seeks.size(); ++i) {
  result.AddSeek(
     QPointF(
      seeks.at(i).toElement().attribute("length", "0").toDouble(),
      seeks.at(i).toElement().attribute("time", "0").toDouble()));
 }
 
 // set progress
 result.progress = 100;
 
 // refresh view
 UpdateScene();
}

void Seeker::EraseResults(DataSet dataset) {
 if(dataset == RESULTS) {
  result.erase();
  dataTicks->erase();
 } else {
  reference.erase();
  referenceTicks->erase();
 }
 UpdateScene();
}

About this web

Initially I created this web page as a project for secondary school computer science course. At that time I had no idea that in some 5 years it will run on my own server. Unfortunately I barely find time to update it, so do not take is as presentation of my skills. The main page is based on the PHP, HTML and CSS, while modern JavaScript client side application is used for gallery. As I focusing mainly on backend programming, my knowledge of web technologies is is not as deep as it should be.

There are also my brothers web on this server (link)

The web itself is running on a small custom-build multipurpose machine located in shelf (not rack) next to my bed. It is based on Intel Celeron CPU powered mini ITX board and takes only 20 watts. The server is running customized Gentoo Linux system. As it is a poor hardware with poor internet connection please do not do anything bad to it.

lighttpd/1.4.78 + PHP:8.2.28
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

About author

My name is Vladimír Matěna. I live in Czech Republic and I have been interested in computers and electronics since my childhood. Initially I was fascinated by electronics, but later I found out that programming and software is what I really like. Because of this, I decided to study programming at the Faculty of Mathematics and Physics at the Charles University in Prague........I am not sure what happend in the mean time, but now I am trying to obtain a Phd degree in computer science.

Some of my projects can be seen on GitHub

My favourite language is C/C++/Qt due to its cleannes and effectiveness, but I can handle Java, C#, JavaScript, Python and many other programming/scripting/markup languages as well. I started coding roughly around year 2000 in QBasic on PMD-85 machine, then...Pascal...Win32 API/C/C++...C#/.NET...Gentoo Linux...C++/Qt...Java...Python Recently, I discovered that coding system kernel from scratch is as fun as programming my own embedded hardware. Unfortunately, time to play is almost over for me and now I am forced to seek compromise in between cleaness/efectiveness and time demands.

Contacts

vla__neopisuj__da__neopisuj__@mattty.cz__neopisuj__
vla__neopisuj__da.mate__neopisuj__na@gmail.co__neopisuj__m
vla__neopisuj__da__neopisuj__@mattty.cz__neopisuj__
2__neopisuj__15__neopisuj__90220__neopisuj__2
v__neopisuj__lad__neopisuj__amat__neopisuj__ena
vlada.gpg