Internet Is Humming Fine

The tech is a magician! He fixed AT&T's crappy DSL line. No red DSL light blinking this week, not once.

DSL Training Errors, Time Since Last Event: 5 days 6:51:19

House of Prime Rib

1906 Van Ness Ave
San Francisco, CA 94109
Tel:(415) 885-4605
http://houseofprimerib.net

They are doing a good imitation of Lawry's, or is it the other way around?

RTFM Saved The Day

Friday afternoon, and I am very down since nothing works.

I admit, Wilsonmar webpage's not the official one, but it's damn close. But then, I noticed this:

LoadRunner uses 1994 GNU C Pre-Processor options and the 1995 LCC-win32 Retargetable C Compiler/Linker from the Free Software Foundation via Chris Fraser of AT&T and Dave Hanson of Princeton.

MySQL C code is compiling nicely now (after one 64bits ref is tweaked).

The New Multi Protocol Script On LR9.1 Is A Useless POS

Q: Can I record ODBC traffic for Action1.c and then record Web traffic for Action2.c (or vice versa)?
A: No.

El Burro's Mexican Restaurant

1875 S Bascom Ave # 570 (The Pruneyard #570)
Campbell, CA 95008-2389
Tel: (408) 371-5800

Not bad, not bad at all

Next Stop: SQLite

Actually no, I was thinking about something more ambitious (MySQL). The fact that I have to hunt down other C library files, forces me to consider SQLite. Just drop sqlite3.dll to $LR/bin, sqlite3.h to $LR/include and trim off the 64 bit references in sqlite3.h to make it works.

But simpler solution doesn’t make my life easier, since writing SQLite code (or any db code), in C, that doesn’t leak memory or crashes the db, is fairly hard.

But finally, I get this:

rc = sqlite3_open("test.db", &db);
if (rc) {
 lr_output_message("Can't open database: %s", sqlite3_errmsg(db));
 sqlite3_close(db);
 return -1;
}
exec = "NO RESULT QUERY SUCH AS: DELETE, INSERT”; 
isPrepared = 0;
while (!isPrepared) {
 rc = sqlite3_prepare(db, exec, -1, &stmt, 0);
 if (rc == SQLITE_OK) { //SQLITE_OK == 0
  isPrepared = 1;
  isExecuted = 0;
  while (!isExecuted) {
   rc = sqlite3_step(stmt);
   /* uncomment this section when exec is a query that return result
   while ((rc == SQLITE_ROW)||(rc == SQLITE_BUSY) ) {
    if (rc == SQLITE_BUSY ) {
     lr_output_message("SQLITE_BUSY - wait for 0.1 seconds");
     lr_think_time(0.1); // TODO: tweak the wait time to your need
    }
    else {
     // extract data
     rc = sqlite3_step(stmt);
    }
   }
   */
   if (rc == SQLITE_DONE) {
    isExecuted = 1;
    sqlite3_finalize(stmt);
   }
   else if (rc == SQLITE_BUSY) { // DB is locked
    lr_output_message("SQLITE_BUSY - wait for 0.1 seconds");
    lr_think_time(0.1); // TODO: tweak the wait time to your need
   }
   else { // real bad stuff usually happens here
    lr_output_message("Cannot execute step, rc = %d", rc);
    lr_output_message("sqlite3_errmsg: %s", sqlite3_errmsg(db));
    lr_output_message("sqlite3_extended_errcode, rc = %d", sqlite3_extended_errcode(db));
    sqlite3_finalize(stmt);
    sqlite3_close(db);
    return -1;
   }
  }
 }
 else if (rc == SQLITE_BUSY) { // DB is locked
  lr_output_message("SQLITE_BUSY - wait for 0.1 seconds");
  lr_think_time(0.1); // TODO: tweak the wait time to your need
 }
 else { // real bad stuff usually happens here
  lr_output_message("Could not prepare statement, rc=%d", rc);
  lr_output_message("sqlite3_errmsg: %s", sqlite3_errmsg(db));
  lr_output_message("sqlite3_extended_errcode, rc = %d", sqlite3_extended_errcode(db));
  sqlite3_close(db);
  return -1;
 }
}
sqlite3_close(db);

Functionally the script works, at 50 virtual users, each running 20 seconds transactions, even the GetUniqueUserName transaction is fairly fast:

• 75% of population: 0.269 +/- 0.731
• 90Percentile: 0.655

But, it doesn’t work at 60 virtual users, it also locks the controller. Not good, need to look into MySQL solution.

ActiveState - People Don't Like You?

This is the first time I heard about people emitting strong comments against ActiveState, but I agree with Dami, ActiveState has been making my life very productive, it's products and business practices has been very satisfactory to me.

Cable Problem Causing The Internet To Fritz

Today, the DSL just decided not to work - again - ever. A technician is scheduled and he replaces the cable and everything works - so far.

LoadRunner Doesn't Like 64 Bit Emulation

LoadRunner doesn't like 64 bit emulation over 32 bit machine. It doesn't like long long declaration on .h header file. It spews:

invalid use of `long'

Thus begin the hacking and slashing of sqlite3.h

Each VUser Must Use Unique Login ID

This is a problem: the web app that I am testing is using the login id as session id. Since I am furnished with data, that has multiple non-unique logins, I have to make sure that all of virtual users are using unique login id.

Several solutions come to mind, but I decided to give LoadRunner VTS a whirl.

Perusing VTS2.doc I quickly hone in lrvtc_send_if_unique function:

VTCERR lrvtc_send_if_unique(char *columnName, char *message)

But this function is pretty much useless since the VTCERR equals 1 no matter if the insertion is successful or not. Trying its cousin instead:

VTCERR vtc_send_if_unique(PVCI pvci, char *columnName, char *message, unsigned short *outRc)

This function returns successful insertion status in outRc parameter (1 = Pass, 0 = Fail).

lr_start_transaction("GetUniqueUserName");
status = 0;
while (status == 0) {
 lr_save_string(lr_eval_string("{pDATAFILEUserName}"), "pUserName");

 pvci = lrvtc_connect(lr_eval_string("{pVTSServer}"), 8888, 0);
 rc = vtc_send_if_unique(pvci, "pUserName1", lr_eval_string("{pUserName}"), &status);
 lr_output_message("Insert if unique, rc = %d, status: = %d", rc, status);
 lrvtc_disconnect();
  
 if (status == 0)  //try another login in the data file if fail
  lr_advance_param("pDATAFILEUserName ");
 else
  user_removed = 0; // just another flag
}
lr_end_transaction("GetUniqueUserName", LR_AUTO);

The login removal process is a trickier than the insert process, since VTS doesn’t have a function to look up a value in a column, a value has to be looked up (one by one):

int removePreviousUserName() { // to eliviate the nasty side effect of exit when error
 int rc = 0;
 unsigned short  status;
 int EOT = 0;
 int i;
 int user_removed = 0;

 lr_start_transaction("RemovePreviousUserName");
 i=lastrowID;

 while (!EOT) {
  i++;
  pvci = lrvtc_connect(lr_eval_string("{pVTSServer}"), 8888, 0);
  
  rc = lrvtc_query_column("pUserName1", i);
  lr_output_message("query row %d, rc = %d", i, rc);

  if (rc!=0)
   EOT = 1;
  else {
   if (stricmp(lr_eval_string("{pUserName}"), lr_eval_string("{pUserName1}")) == 0)  {
    lr_output_message("Del msg (%s) at row %d", lr_eval_string("{pUserName1}"), i);
    rc = vtc_clear_message(pvci, "pUserName1", i, &status);
    lr_output_message("Del msg, rc = %d, Status = %d", rc, status);
    lastrowID = i;
    EOT = 1; // exit anyway
    user_removed = 1;
   }
  }
  lrvtc_disconnect();
 }
 lr_end_transaction("RemovePreviousUserName", LR_AUTO);
 return user_removed;
}

A little explanation about lastrowID, when a data is deleted from VTS, a value can never be re-inserted into that row again via vtc_send_if_unique function. So, there are lots of empty rows at the lower index after the value is deleted. Thus there is no point for the script to start the search for a login to delete from row 1; instead it should start the search from the last deletion point.

Functionally the script works, but VTS system is not capable of handling multiple virtual users. At 10 virtual users, each running 20 seconds transactions, VTS is throwing numerous -10003 errors, that causes slow GetUniqueUserName transaction:

• 75% of population: 2.201 +/- 2.912
• 90 Percentile: 6.506

2.2 seconds on the average to insert unique value? I don’t think so. I need a better solution.

Internet Is All Good

The Alarm app on my BlackBerry seg-faulted this morning. Too bad I was too groggy & pissed off to take a picture, it would be interesting.

Note to self: steal an olde alarm clock from Lisa.

Btw: Internet is all good, looks like I don't need to talk to the good people in St Louis after all.

AT&T Support, The Competency May Varies

AT&T support @ 800-288-2020: FireFox's history/cookies causes the router's red light (DSL) to blink & drop the internet.

I think I should better wait for the good AT&T support (866-865-7685) in St Louis to wake up.

Identifying Location Based On The Soil's Microbial Makeup

Received this email and it raised little hairs on my neck.

from Melanie S
date Wed, Aug 12, 2009 at 6:05 PM
subject JOB: soil microbiome profiling @ LLNL (must be US citizen)

Tom Slezak, Biodefense Group Leader, Lawrence Livermore National Laboratory, https://www.llnl.gov/str/April04/Slezak.html, mentioned last week at the Microarray World Congress, http://www.selectbiosciences.com/conferences/MWC2009/Agenda.aspx, that he has a funded soil microbiome profiling position currently available.

The candidate must be a US citizen, and should ideally have a PhD in a related field such as bioinformatics and 1-4 years work experience. Tom’s contact information is here: https://www.llnl.gov/str/April04/Slezak.html

Specifically, the position/project entails looking at:

* Can soil microbiome profiling characterize locations? To what resolution?
* Determine the ability to characterize locations by analyzing microbial content
* Utilize microarrays and sequencing to determine the ability to resolve where a soil sample came from or rule out locations
* Develop a soil microbiome microarray to provide a low-cost way to ‘fingerprint’ locations
* Determine degree of location resolution possible due to species-level soil microbe differences

Uh-oh Dexter, beware of that dirt on your shoes.

Translating The Name of Month To Number

Another Perl code posted since I am getting tired of rewriting it all the time.

my %months = (
 Jan=>1, Feb=>2, Mar=>3, Apr=>4,  May=>5,  Jun=>6, 
 Jul=>7, Aug=>8, Sep=>9, Oct=>10, Nov=>11, Dec=>12,
 January=>1,  February=>2,  March=>3, 
 April=>4,    May=>5,       June=>6, 
 July=>7,     August=>8,    September=>9, 
 October=>10, November=>11, December=>12,
);

eg:

parseDate('Jan  1 2009 12:00:00:000AM');

sub parseSQLDate {
 my ($txt) = @_;
 
 if ($txt =~ /^(\w+)\s+(\d+)\s+(\d+)\s+(\d+):(\d+):(\d+):(\d+)/) {
  use DateTime;
 
  my %months = (
   Jan=>1, Feb=>2, Mar=>3, Apr=>4,  May=>5,  Jun=>6, 
   Jul=>7, Aug=>8, Sep=>9, Oct=>10, Nov=>11, Dec=>12,
   January=>1,  February=>2,  March=>3, 
   April=>4,    May=>5,       June=>6, 
   July=>7,     August=>8,    September=>9, 
   October=>10, November=>11, December=>12,
  );
  
  my $dt = DateTime->new( 
   year   => $3,
   month  => $months{$1},
   day    => $2,
   time_zone => 'floating',
  );
  
  return $dt;
 }
}

SQL Server Version

From: How to identify your SQL Server version and edition

SELECT @@VERSION

or

SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY ('productlevel'), SERVERPROPERTY ('edition')