mummergpu-devel — General MUMmerGPU discussion

[MUMmerGPU-devel] Maf file

[Roger L. <rog...@gm...>]

I am a researcher at Idaho State working on evolutionary development of bat
wings. This is my first post to this list.

Does MummerGPU create a .maf file? If not, is there a conversion program? I
need an alignment program that will align several large genomes (2 GB) and
create a .maf file for input into phyloP (phastcons).

Thanks,
Roger

[MUMmerGPU-devel] MUMmerGPU ATI graphics card

[Gabriel G. N. <gar...@gm...>]

I want to know if MUMmerGPU works with an  ATI video card, more precisely an
 HD5850 1GB GDDR5.
Thanks for your reply

Gabriel

[MUMmerGPU-devel] Realloc error with data set

[Akila G. <aki...@gm...>]

Hello,

I have a data set I'm trying to test using mummergpu. Although  
initially the amount of on-board memory resulted in errors, using the  
Tesla C2070
card (with ECC off and CUDA 3.2) seemed to fix the problem. However, I  
am now getting the following error:

Loading query block ... ERROR: Realloc failed, requested: -2147483648

This message is output from suffix-tree.cpp where the size of the  
buffer is doubled. Is this error got to do with the size of my query  
sequence?

Thanks,
Akila 

[MUMmerGPU-devel] Building MummerGPU 2.0 with CUDA 3.2

[Meehan, Joe* <Joe...@fd...>]

This doesn't seem to be a very active list, but I did want to report that I was able to build MummerGPU 2.0 on CUDA 3.2 after making a few small changes to overcome the problems mentioned in other posts:

The error on line 468 of mummergpu.cu regarding an "unsigned int *" argument being incompatible with a "size_t *" parameter is due to a change in the parameters of cuMemGetInfo() in CUDA 3.2.  See the following PDF for more info:

http://developer.download.nvidia.com/compute/cuda/3_2/toolkit/docs/CUDA_3.2_Readiness_Tech_Brief.pdf

NVIDIA says that fixing this with a cast is unsafe.  The solution is to change the variables used for memory size from "unsigned int" to "size_t", which has some ripple effects throughout the source code.

The multiple definition of GetRef is due to it being defined once for the CPU and once for the GPU.  I'm not sure why this is a problem, but I just renamed the GPU version in mummergpu_kernel.cu to getRefDev and changed the function calls in that file to match.

Finally, the inability to find -lcudart in my case was due to the Makefile specifying /usr/local/lib instead of /usr/local/lib64.  I changed the definition of LIB in the makefile to use lib64 instead of lib, and it worked.

I haven't tried to upload any of these changes to SourceForge, but if anyone is interested I'll look into it.

Regards,
Joe Meehan

[MUMmerGPU-devel] Can not build MummerGPU

[ali d. <ali...@gm...>]

Hi,
I am trying to build MummerGPU on my machine which is Fermi GX460.
this is what I get:

rm -f ../obj/release/mummergpu_gold.cpp_o ../obj/release/suffix-tree.cpp_o
../obj/release/PoolMalloc.cpp_o ../obj/release/mummergpu.cu_o
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses
-Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type
-Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O3 -o
../obj/release/mummergpu_gold.cpp_o -c mummergpu_gold.cpp
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses
-Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type
-Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O3 -o
../obj/release/suffix-tree.cpp_o -c suffix-tree.cpp
rm -f ../lib/libmummergpu.a
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses
-Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type
-Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O3 -o
../obj/release/PoolMalloc.cpp_o -c PoolMalloc.cpp
/usr/local/cuda/bin/nvcc  -o ../obj/release/mummergpu.cu_o -c mummergpu.cu
-Xcompiler ""  -I. -I/usr/local/cuda/include  -DUNIX -O3
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses
-Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type
-Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O3 -o
../obj/release/mummergpu_main.cpp_o -c mummergpu_main.cpp
rm -f ../obj/release/mummergpu_main.cpp_o
rm -f ../bin/release/mummergpu
mummergpu.cu: In function ‘void buildReferenceTexture(Reference*, char*,
size_t, size_t, int, char*, char*, Statistics*)’:
mummergpu.cu:390: warning: format ‘%d’ expects type ‘int’, but argument 3
has type ‘size_t’
mummergpu.cu:453: warning: format ‘%d’ expects type ‘int’, but argument 3
has type ‘size_t’
mummergpu.cu: In function ‘void loadResultBuffer(MatchContext*)’:
mummergpu.cu:1070: warning: format ‘%d’ expects type ‘int’, but argument 4
has type ‘long unsigned int’
mummergpu.cu: In function ‘void coordsToPrintBuffers(MatchContext*,
ReferencePage*, MatchInfo**, Alignment**, unsigned int, unsigned int*,
unsigned int*, unsigned int*, unsigned int*, unsigned int*)’:
mummergpu.cu:1335: warning: format ‘%d’ expects type ‘int’, but argument 3
has type ‘long unsigned int’
mummergpu.cu: In function ‘void runPrintKernel(MatchContext*,
ReferencePage*, MatchInfo*, unsigned int, Alignment*, unsigned int)’:
mummergpu.cu:1362: warning: format ‘%d’ expects type ‘int’, but argument 3
has type ‘long unsigned int’
mummergpu.cu: In function ‘void
matchQueryBlockToReferencePage(MatchContext*, ReferencePage*, bool)’:
mummergpu.cu:2010: warning: format ‘%d’ expects type ‘int’, but argument 3
has type ‘size_t’
mummergpu.cu:2010: warning: format ‘%d’ expects type ‘int’, but argument 4
has type ‘size_t’
mummergpu.cu:2010: warning: format ‘%d’ expects type ‘int’, but argument 5
has type ‘size_t’
ar qv ../lib/libmummergpu.a ../obj/release/mummergpu_gold.cpp_o
../obj/release/suffix-tree.cpp_o ../obj/release/PoolMalloc.cpp_o
../obj/release/mummergpu.cu_o
ar: creating ../lib/libmummergpu.a
a - ../obj/release/mummergpu_gold.cpp_o
a - ../obj/release/suffix-tree.cpp_o
a - ../obj/release/PoolMalloc.cpp_o
a - ../obj/release/mummergpu.cu_o
g++  -o ../bin/release/mummergpu  ../obj/release/mummergpu_main.cpp_o
-lmummergpu -L/usr/local/cuda/lib -L../lib -lcudart -lcuda
../lib/libmummergpu.a(mummergpu_gold.cpp_o): In function `getRef(int,
char*)':
mummergpu_gold.cpp:(.text+0x0): multiple definition of `getRef(int, char*)'
../lib/libmummergpu.a(mummergpu.cu_o):tmpxft_00002453_00000000-1_mummergpu.cudafe1.cpp:(.text+0x1520):
first defined here
/usr/bin/ld: skipping incompatible /usr/local/cuda/lib/libcudart.so when
searching for -lcudart
/usr/bin/ld: cannot find -lcudart
collect2: ld returned 1 exit status
make: *** [../bin/release/mummergpu] Error 1

I have CUDA and I ran codes on GPU before!
Thanks for your help,
Ali

[MUMmerGPU-devel] MummerGPU 2.0 fails to build with CUDA 3.2 on Tesla "Fermi"

[M C <m_...@ho...>]

Hi,

I'm trying to use MummerGPU 2.0 on an Amazon EC2 GPU cluster instance (containing two Tesla M2050 "Fermi" cards), with CUDA 3.2, but the building process fails (whereas it worked fine on an older Tesla C1030 card with CUDA 2.3). The initial error I get is:

###
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses -Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type -Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O1 -o ../obj/release/PoolMalloc.cpp_o -c PoolMalloc.cpp
/usr/local/cuda/bin/nvcc  -o ../obj/release/mummergpu.cu_o -c mummergpu.cu  -Xcompiler ""  -I. -I/usr/local/cuda/include  -DUNIX -O1
mummergpu.cu(468): error: argument of type "unsigned int *" is incompatible with parameter of type "size_t *"

mummergpu.cu(468): error: argument of type "unsigned int *" is incompatible with parameter of type "size_t *"

2 errors detected in the compilation of "/tmp/tmpxft_00003713_00000000-4_mummergpu.cpp1.ii".
make: *** [../obj/release/mummergpu.cu_o] Error 2
###

If I try to get past the error by changing line 468 from:

CU_SAFE_CALL_NO_SYNC(cuMemGetInfo(free_mem, total_mem));

to make the explicit cast:

CU_SAFE_CALL_NO_SYNC(cuMemGetInfo((size_t *)free_mem, (size_t *)total_mem));

then I can past this compilation stage but now the linking fails with the error:

###
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses -Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type -Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O1 -o ../obj/release/mummergpu_main.cpp_o -c mummergpu_main.cpp
g++  -o ../bin/release/mummergpu  ../obj/release/mummergpu_main.cpp_o -lmummergpu -L/usr/lib64 -L/usr/local/cuda/lib64 -L../lib -lcudart -lcuda  
../lib/libmummergpu.a(mummergpu_gold.cpp_o): In function `getRef(int, char*)':
mummergpu_gold.cpp:(.text+0x0): multiple definition of `getRef(int, char*)'
../lib/libmummergpu.a(mummergpu.cu_o):tmpxft_00003748_00000000-1_mummergpu.cudafe1.cpp:(.text+0x12fe): first defined here
###

Can anyone suggest a fix please? I tried by commenting the function getRef from the file mummergpu_gold.cpp and declaring it as extern (since it seems to already be in libmummergpu.a), which allowed the compilation to complete and give an executable, but this then produces a segmentation fault when run with the package's test data.

Help please!

m
 		 	   		  

[MUMmerGPU-devel] Assertion error

[Pankaj G. <pan...@st...>]

Hello,

I've been trying to align human Chr 13 query sequences with the Chr 13
reference using MUMmerGPU 2.0, but I get the following error:

Flattening Tree... mummergpu: suffix-tree.cpp:1303: void
buildSuffixTreeTexture(PixelOfNode**, PixelOfChildren**, unsigned int*,
unsigned int*, unsigned int*, AuxiliaryNodeData**, const char*, int):
Assertion `allnodes < MAX_TEXTURE_DIMENSION*MAX_TEXTURE_DIMENSION'
failed.
Aborted


My configuration is:
Graphics card: NVIDIA GeForce 9800 GT
GPU memory: 1 GB
CUDA version: 3.0
OS: Ubuntu 10.04 32-bit

Does anyone know how this can be fixed? I'd really appreciate any help.

Thanks,

Pankaj




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[MUMmerGPU-devel] Cuda run-time error in MUMmerGPU-2.0

[Pankaj G. <pan...@st...>]

Hi,

I'm getting run-time error when I run MUMmerGPU-2.0 with a small
dataset. Here's the error I get:

*******************************************************
$ /opt/mummergpu-2.0/bin/release/mummergpu AE016877.fa
DeNovo_BacillusTotal.fasta >allRefsVsAllContigs.txt

TWO_LEVEL_NODE_TREE is 0
TWO_LEVEL_CHILD_TREE is 0
QRYTEX is 0
COALESCED_QUERIES is 0
REFTEX is 0
REORDER_REF is 0
NODETEX is 1
CHILDTEX is 1
MERGETEX is 0
REORDER_TREE is 1
RENUMBER_TREE is 1
Loading ref: AE016877.fa... 5411749 bp. [0.24514s]
Opening DeNovo_BacillusTotal.fasta...
Streaming reference pages against all queries
Stream will use 1 pages for 5411749 bases, page size = 5411749
Building reference texture...
  Creating Suffix Tree... 8920613 nodes [2.65961s]
  Renumbering tree... [1.05719s]
  Flattening Tree...  node: 4096x2208 children: 4096x2208 [4.75442s]
This tree will need 289406976 bytes on the board
The refstr requires 5415850 bytes
Beginning reference page 0x8ac8260
board free memory: 900464640 total memory: 1073020928
done
Loading query block... 69343 queries (53585598 bp), need 472451918 bytes
on the GPU (588864598 avail) [1.05587s]
done.
Allocating device memory for queries...         Processing queries C10_contig_1
to C9_contig_6702
        allocated 54282166 bytes
Matching queries C10_contig_1 - C9_contig_6702 against ref coords 1 -
5415848
Need 52271219 match coords for this result array
Allocating result array for 69343 queries (418169752 bytes) ...board
free memory: 550240256 total memory: 1073020928
done
Memory footprint is:
        queries: 54282166
        ref: 294822826
        results: 418169752
match kernel time= 11892.340820
Cuda error in file 'mummergpu.cu' in line 1144 : 6 (the launch timed out
and was terminated).
Trapped
**********************************************

My NVidia/CUDA/MUMmerGPU configuration is:

Graphics card: NVIDIA GeForce 9800 GT
NVidia Driver version: 195.36.15
CUDA toolkit version: 3.0
MUMmerGPU version: 2.0
GCC version: gcc-4.3
OS: Ubuntu 9.10 32-bit
**********************************************

Previously MUMmerGPU was working with the above dataset and
NVidia/CUDA/MUMmerGPU configuration, but recently it's been throwing the
above error. I would really appreciate any help in this regard.

Thanks for your help in advance!

Pankaj


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[MUMmerGPU-devel] Problems compiling mummergpu 2.0

[<as...@sa...>]

Hi everyone,

I'm trying to compile mummergpu2 but i'm having problems with it. My system:

Fedora 10 x86_64
GeForce 8800 GTS
gcc version 4.3.2
Cuda compilation tools, release 2.3, V0.2.1221


This is what I'm obtaining:

rm -f ../obj/release/mummergpu_gold.cpp_o ../obj/release/suffix-tree.cpp_o
../obj/release/PoolMalloc.cpp_o ../obj/release/mummergpu.cu_o
rm -f ../lib/libmummergpu.a
rm -f ../obj/release/mummergpu_main.cpp_o
rm -f ../bin/release/mummergpu
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses
-Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type
-Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O3 -o
../obj/release/mummergpu_gold.cpp_o -c mummergpu_gold.cpp
g++  -W -Wall -Wimplicit -Wswitch -Wformat -Wchar-subscripts -Wparentheses
-Wmultichar -Wtrigraphs -Wpointer-arith -Wcast-align -Wreturn-type
-Wno-unused-function   -I. -I/usr/local/cuda/include  -DUNIX -O3 -o
../obj/release/suffix-tree.cpp_o -c suffix-tree.cpp
suffix-tree.cpp: In function ‘const char* substr(const char*, int, int)’:
suffix-tree.cpp:50: error: ‘strncpy’ was not declared in this scope
suffix-tree.cpp: In constructor ‘EventTime_t::EventTime_t()’:
suffix-tree.cpp:84: error: ‘memset’ was not declared in this scope
suffix-tree.cpp: In constructor ‘SuffixTree::SuffixTree(const char*)’:
suffix-tree.cpp:333: error: ‘strlen’ was not declared in this scope
suffix-tree.cpp: In function ‘void getReferenceString(const char*, char**,
size_t*)’:
suffix-tree.cpp:1670: error: ‘strdup’ was not declared in this scope
suffix-tree.cpp:1671: error: ‘strlen’ was not declared in this scope
suffix-tree.cpp: In function ‘void getQueriesTexture(int, char**, size_t*,
int**, char***, int**, unsigned int*, unsigned int*, unsigned int, int,
bool)’:
suffix-tree.cpp:1787: error: ‘strdup’ was not declared in this scope
suffix-tree.cpp:1890: error: ‘strdup’ was not declared in this scope
suffix-tree.cpp: In function ‘int addToBuffer(char*)’:
suffix-tree.cpp:2108: error: ‘strlen’ was not declared in this scope
suffix-tree.cpp:2113: error: ‘strncpy’ was not declared in this scope
suffix-tree.cpp:2122: error: ‘strncpy’ was not declared in this scope
suffix-tree.cpp: In function ‘void printAlignmentsOld(ReferencePage*,
char*, int, int, int, int, int, bool, bool)’:
suffix-tree.cpp:2398: error: ‘strlen’ was not declared in this scope
suffix-tree.cpp: In function ‘void printAlignments(ReferencePage*,
Alignment*, char*, int, TextureAddress, int, int, int, bool, bool)’:
suffix-tree.cpp:2435: error: ‘strlen’ was not declared in this scope
make: *** [../obj/release/suffix-tree.cpp_o] Error 1

So, I don't program in c++ but I checked the code and according to the
error the problem begins here:

char substrbuffer[1024];
const char * substr(const char * str, int start, int len)

str, start and len are not getting values for some reason. Hence, the
other variables that take their values using the previous ones, are also
empy.

Other things is that there's a new CUDA 3.0 which I also tried and give me
the same problem.

Any ideas?



-- 
 The Wellcome Trust Sanger Institute is operated by Genome Research 
 Limited, a charity registered in England with number 1021457 and a 
 company registered in England with number 2742969, whose registered 
 office is 215 Euston Road, London, NW1 2BE. 

[MUMmerGPU-devel] MummerGPU 2.0?

[M C <m_...@ho...>]

Hi all,

Is MUMmerGPU 2.0 available for download yet? I notice from the online article "Optimizing data intensive GPGPU computations for DNA sequence alignment" that it should be available for download from the sourceforge site, but as far as I can tell v1.1 is the latest that's available. 

If v2.0 is still not ready for release, is a patched version of v1.1 that  supports CUDA 2+ available? I note form a post on this forum dating back to 15th July 2008 that:

"MUMmerGPU requires CUDA 1.1 since some of the APIs have changed between the version. Once CUDA 2.0 is fully released (not beta), we'll update the package for the new release."

Was the package ever updated? The version that's currently updated fails to build with CUDA 2.3.

Thx for any help,
m
 		 	   		  
_________________________________________________________________
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[MUMmerGPU-devel] MUMmer GPU Segmentation fault and a few fixes

[Jaakan S. <jaa...@gm...>]

I did read through the thread "Re: [MUMmerGPU-devel] MUMmer GPU build error"

that did help me. I'm also at the point were CPU using the -C switch
works and Segmentation faults without it.
I have access to NV GPU+RHEL5 x64 server, if you need me to send you
the gdb/debuged output


I might have done a few more changes to get this to run on RHEL5 x64,
I can tar.gz my current source for this with my changes if anyone
needs to look at all of the changes.

I hope I can help.

--Jaakan

Here are some changes I made to fix the following warnings on 64bit
linux and don't forget to add " #include <stdint.h> "
"warning: conversion from pointer to smaller integer"
 this " * timer = (unsigned int) ptr " should be "  * timer = (uintptr_t) ptr"

"warning: cast to pointer from integer of different size"

basicly "unsigned int ptr" needs to be "uintptr_t ptr"



mummergpu.cu
...

#include <stdint.h>
// includes, kernels
#include "common.cu"
#include "mummergpu.h"
#include "mummergpu_kernel.cu"

#define ulong4 uint32_t

....

// Timer management
struct Timer_t
{
  struct timeval start_m;
  struct timeval end_m;
};

void createTimer(unsigned int * timer)
{
  unsigned int * ptr = (unsigned int *) malloc(sizeof(struct Timer_t));
  memset(ptr, 0, sizeof(struct Timer_t));

   // * timer = (unsigned int) ptr;
   * timer = (uintptr_t) ptr;
}

// void startTimer(unsigned int ptr)
void startTimer(uintptr_t ptr)
{
  gettimeofday(&(((struct Timer_t *)ptr)->start_m), NULL);
}

// void stopTimer(unsigned int ptr)
void stopTimer(uintptr_t ptr)
{
  gettimeofday(&(((struct Timer_t *)ptr)->end_m), NULL);
}

//float getTimerValue(unsigned int ptr)
float getTimerValue(uintptr_t ptr)
{
  Timer_t * timer = (Timer_t*) ptr;

  if (timer == NULL)
  {
    fprintf(stderr, "Uninitialized timer!!!\n");
    return 0.0;
  }

  if (timer->end_m.tv_sec == 0) { stopTimer(ptr); }

  return  (float) (1000.0 * (timer->end_m.tv_sec - timer->start_m.tv_sec)
                + (0.001 *  (timer->end_m.tv_usec - timer->start_m.tv_usec)));
}

//void deleteTimer(unsigned int ptr)
void deleteTimer(uintptr_t ptr)
{
  free((Timer_t *)ptr);
}

....

I changed    " ulong4 data " to " unsigned int data " in the following.

common.cu
....

#ifndef COMMON_CU__
#define COMMON_CU__ 1
// Children are labeled as ACGT$
const int basecount = 5;

// Note: max pixel size is 16 bytes

const unsigned char DNA_A = 'A';
const unsigned char DNA_C = 'B';
const unsigned char DNA_G = 'C';
const unsigned char DNA_T = 'D';
const unsigned char DNA_S = 'E';

// 4 bytes
struct TextureAddress
{
  union
  {
    unsigned int data;

    struct
    {
	  unsigned short x;
      unsigned short y;
    };
  };
};

// Store the start, end coordinate of node, and $link in 1 pixel
struct PixelOfNode
{
  union
  {
    // ulong4 data;
	unsigned int data;
    struct
    {
      int start;
      int end;
      TextureAddress childD;
      TextureAddress suffix;
    };
  };
};

// Store the ACGT links in 1 pixel
struct PixelOfChildren
{
  union
  {
    // ulong4 data;
	unsigned int data;
	TextureAddress children[4];
  };
};

#define FORWARD   0x0000
#define REVERSE   0x8000
#define FRMASK    0x8000
#define FRUMASK   0x7FFF


#endif

[MUMmerGPU-devel] MummerGPU Error 255

[Mohanram G. <mg...@co...>]

Hi,

  I'm trying to compile MummerGPU for my machine, and I have not been able
to get around the 255 error. My system config is as follows:

RHEL 5.1 - server config
GCC 4.1.2
NVidia Geforce 8800GTS (512 Mb)
NVidia driver ver 169.09
CUDA SDK + Toolkit ver 1.1

I would appreciate any help on this, since I am trying to work with SOLEXA
data, and wanted to see if I could use MummerGPU in my pipeline.

Thanks in advance!

best,
Mohan

The error message is as follows:

=====

/usr/local/cuda/bin/nvcc  -o obj/release/mummergpu.cu_o -c mummergpu.cu
-Xcompiler "-m32" -Xcompiler "" -I. -I/usr/local/cuda/include  -DUNIX -O3
"mummergpu.cu", line 96: warning: conversion from pointer to smaller integer
    *timer = (unsigned int) ptr;
             ^

"/usr/local/cuda/bin/../include/texture_fetch_functions.h", line 616: error:
          no suitable user-defined conversion from "uint4" to "ulong4" exists
    return T(v);
             ^
          detected during instantiation of "T tex2D(texture<T, 2, readMode>,
                    float, float) [with T=ulong4,
                    readMode=cudaReadModeElementType]" at line 122 of
                    "./mummergpu_kernel.cu"

1 error detected in the compilation of "/tmp/tmpxft_00007756_00000000-2.ii".
make: *** [obj/release/mummergpu.cu_o] Error 255

===

[MUMmerGPU-devel] Welcome to mummergpu-devel

[Michael S. <ms...@um...>]

If you have any general questions regarding MUMmerGPU, please send
email to this mailing list.

Thank you,

Michael Schatz

http://www.cbcb.umd.edu/~mschatz