SPVM::Document::Tutorial - SPVM Performance Tutorial
This document is SPVM Tutorial. Describes SPVM basic grammers, how to get more performance, how to bind C/C++ libraries.
SPMV Installation is described. SPVM is a programing language, but also SPVM is a CPAN module writen by Perl and C language. You can install SPVM from CPAN using cpan or cpanm command.
Install SPVM using <a href="https://metacpan.org/pod/distribution/App-cpanminus/bin/cpanm">cpanm</a> if you has user Perl in user directory using <a href="https://perlbrew.pl/">perlbrew</a> or <a href="https://github.com/tokuhirom/plenv">plenv</a>.
cpanm SPVM
Install SPVM using cpan command.
cpan SPVM
The Advantages is that you can upgrade by simply installing SPVM from CPAN.
SPVM is a programming language, but also a Perl module, and works with Perl.
Binary compatibility is kept in upgrading unlike Perl in this point.
SPVM has a Native API for operating SPVM in cooperation with C language. In the C language level, SPVM has a way to keep the backward compatibility when upgrading.
Let's take SPVM for the first time. Then, let's improve the performance of the SPVM code.
Let's take SPVM for the first time. This is a first simple example. Let's calcurate the sum of numbers.
Create SPVM module. The extension is "spvm". In this example, the name of SPVM module is "SPVM/MyMath.spvm".
Create "SPVM/MyMath.spvm" in the "lib" directory, and you write the following code.
# lib/SPVM/MyMath.spvm class MyMath { static method sum : int ($nums : int[]) { my $total = 0; for (my $i = 0; $i < @$nums; $i++) { $total += $nums->[$i]; } return $total; } }
The class keyword defines a class.
class
# Class Definition class MyMath { }
See also <a href="/language.html#language-class">Class - SPVM Language Specification</a> about Class.
The method keyword defines a method. If the method doesn't have the instance, you define a static method using a static attribute.
method
static
class MyMath { # Static method definition static method sum : int ($nums : int[]) { } }
See also <a href="/language.html#language-method">Method - SPVM Language Specification</a> about Method.
int type in sum return value is signed 32bit integer type. This is same as C99 int32_t.
int
SPVM has the following types as other numeric types.
See also <a href="http://59.106.185.196:3000/spvmdoc-public/language.html#language-type">Type - SPVM Language Specification</a> about Type.
int[] type in sum arguments is array of int type.
int[]
The numeric array type guarantees that the values are consecutive in memory.
In this point, unlike Perl where all value are assigned to the dynamic type SV, SPVM has a static type, so it can represent a efficient sequence of numbers.
Write Local Variable Declaration by my keyword. You can initialize variables at the same time you declare variables.
my
my $total = 0;
The above declaration has the same meaning as:
my $total : int = 0;
0 on the right side is a signed 32-bit integer, so the type of the variable is automatically determined by type inference.
See also <a href="/language.html#language-local-var">Local Variable - SPVM Language Specification</a> about Local Variable Declaration.
See also <a href="/language.html#language-type-inference">Type Inference - SPVM Language Specification</a> about Type Inference.
0 is Integer Literal.
SPVM has the following Literal.
# Integer Literal 123 123_456_789 # Floating Point Literal 1.32 1.32f # Character Literal 'a' 'c' # String Literal "Hello World!"
See also <a href="/language.html#language-literal">Literal - SPVM Language Specification</a> about Literal.
Let's look at the part where the sum of the arrays is calculated.
for (my $i = 0; $i < @$nums; $i++) { $total += $nums->[$i]; }
See @$nums.
@$nums
@ is Array Length Operator to get array length.
Unlike Perl, which is context sensitive, Array Length Operator of SPVM always returns the length of the array.
Note that SPVM has no context.
See <a href="/language.html#language-operator-array-length">Array Length Operator - SPVM Language Specification</a> about Array Length Operator
Incremental Operator increment the value.
$i++
See <a href="http://59.106.185.196:3000/spvmdoc-public/language.html#language-operator-inc">Increment Operator - SPVM Language Specification</a> about Incremental Operator.
See <a href="http://59.106.185.196:3000/spvmdoc-public/language.html#language-operator-dec">Decrement Operator - SPVM Language Specification</a> about Decrement Operator.
Array Access can be done by "->" Arrow Operator.
$nums->[$i]
See <a href="http://59.106.185.196:3000/spvmdoc-public/language.html#language-array">Array - SPVM Language Specification</a> about Array operation.
See the following code.
$total += $nums->[$i];
This is same as the following Additon Operator and Assignment Operator.
$total = $total + $nums->[$i];
SPVM has many operators.
See <a href="/language.html#language-operator">Operator - SPVM Language Specification</a> about Opeartor.
Next, see for Statement.
See <a href="/language.html#language-statement-for">for Statement - SPVM Language Specification</a> about for Statement.
See <a href="/language.html#language-statement">Statement - SPVM Language Specification</a> about Statement like if Statement, while Statement, and switch Statement.
At last, return Statement.
return $total;
See <a href="/language.html#language-statement-return">return Statement - SPVM Language Specification</a> about return Statement.
Create "sum.pl" file and write the following code. This is Perl program.
use strict; use warnings; use FindBin; use lib "$FindBin::Bin/lib"; use SPVM 'MyMath'; # Call method my $total = SPVM::MyMath->sum([3, 6, 8, 9]); print "Total: $total\n"; # Call method with packed data my $nums_packed = pack('l*', 3, 6, 8, 9); my $api = SPVM::api(); my $sp_nums = $api->new_int_array_from_bin($nums_packed); my $total_packed = SPVM::MyMath->sum($sp_nums); print "Total Packed: $total_packed\n";
The followings are the conventions and add current script directry's "lib" directory to library path .
use strict; use warnings; use FindBin; use lib "$FindBin::Bin/lib";
use SPVM module.
use SPVM 'MyMath';
In this place, compilation is not done. Collect SPVM modules.
Call SPVM Method. It's amazing that SPVM method can be called as Perl method.
# Call method my $total = SPVM::MyMath->sum([3, 6, 8, 9]);
Perl array reference is converted to SPVM int array.
See <a href="/exchange-api.html#exchange-api-perl-data-to-spvm-value">Convert Perl Data to SPVM Value - SPVM Exchange AP/a about Conversion of Perl Data to SPVM Value.
SPVM int return value is converted to Perl Scalar.
See <a href="/exchange-api.html#exchange-api-spvm-value-to-perl-data">Converting SPVM Value to Perl Data - SPVM Exchange AP/a about Conversion of Perl Data to SPVM Value.
you can pass packed binary data. "new_int_array_from_bin" in SPVM::ExchangeAPI create SPVM int array from packed binary data. This is efficient.
# Call method with packed data my $nums_packed = pack('l*', 3, 6, 8, 9); my $api = SPVM::api(); my $sp_nums = $api->new_int_array_from_bin($nums_packed); my $total_packed = SPVM::MyMath->sum($sp_nums);
<h3>How to improve SPVM Performance</h2>
See How to improve SPVM Performance.
If you're searching SPVM for performance reasons, here's what you really want to see.
SPVM Module:
Use SPVM Module from Perl
# sum.pl use strict; use warnings; use FindBin; use lib "$FindBin::Bin/lib"; use SPVM 'MyMath'; # Call method my $total = SPVM::MyMath->sum([3, 6, 8, 9]); print "Total: $total\n"; # Call method with packed data my $nums_packed = pack('l*', 3, 6, 8, 9); my $api = SPVM::api(); my $sp_nums = $api->new_int_array_from_bin($nums_packed); my $total_packed = SPVM::MyMath->sum($sp_nums); print "Total Packed: $total_packed\n";
Precompiled SPVM Method. This means SPVM code is converted to Machine Code:
# lib/SPVM/MyMath.spvm class MyMath : precompile { static method sum_precompile : int ($nums : int[]) { my $total = 0; for (my $i = 0; $i < @$nums; $i++) { $total += $nums->[$i]; } return $total; } }
Call SPVM Precompile Method from Perl
# sum_precompile.pl use strict; use warnings; use FindBin; use lib "$FindBin::Bin/lib"; use SPVM 'MyMath'; # Call precompile method my $total_precompile = SPVM::MyMath->sum_precompile([3, 6, 8, 9]); print "Total Precompile: $total_precompile\n";
SPVM Native Method. This means SPVM method call C/C++ native method:
# lib/SPVM/MyMath.spvm class MyMath { native static method sum_native : int ($nums : int[]); } // lib/SPVM/MyMath.c #include "spvm_native.h" int32_t SPVM__SPVM__MyMath__sum_native(SPVM_ENV* env, SPVM_VALUE* stack) { void* sv_nums = stack[0].oval; int32_t length = env->length(env, stack, sv_nums); int32_t* nums = env->get_elems_int(env, stack, sv_nums); int32_t total = 0; for (int32_t i = 0; i < length; i++) { total += nums[i]; } stack[0].ival = total; return 0; } # lib/SPVM/MyMath.config use strict; use warnings; use SPVM::Builder::Config; my $config = SPVM::Builder::Config->new_gnu99; $config;
Use SPVM Native Method from Perl
# sum_native.pl use strict; use warnings; use FindBin; use lib "$FindBin::Bin/lib"; use SPVM 'MyMath'; # Call native method my $total_native = SPVM::MyMath->sum_native([3, 6, 8, 9]); print "Total Native: $total_native\n";
Environment Variable "SPVM_BUILD_DIR" must be set for precompile and native method
# bash example export SPVM_BUILD_DIR=~/.spvm_build
The advantage of SPVM is that you can easily bind C/C++/CUDA.
Methods bound with SPVM can be easily called from Perl.
Before reading this page, you need to understand Native API.
First, let's bind our own C library.
The following source code is the completed source code.
I will explain using this source code.
<a href="https://github.com/yuki-kimoto/SPVM/tree/master/examples/native/bind_clib">SPVM Native Example - Bind C Library</a>
Create a C language library for summation and call it from Perl.
# bind_clib.pl use strict; use warnings; use FindBin; use lib "$FindBin::Bin/lib"; use SPVM 'BindCLib'; my $total = SPVM::BindCLib->sum([1, 2, 3, 4]); print "Total: $total\n";
SPVM Method Definition.
# lib/SPVM/BindCLib.spvm class BindCLib { native static method sum : int ($nums : int[]); }
Native Config.
# lib/SPVM/BindCLib.config use strict; use warnings; use SPVM::Builder::Config; my $config = SPVM::Builder::Config->new_gnu99; $config;
Call C library from C program.
// lib/SPVM/BindCLib.c #include "spvm_native.h" #include "bind_clib.h" int32_t SPVM__SPVM__BindCLib__sum(SPVM_ENV* env, SPVM_VALUE* stack) { void* sv_nums = stack[0].oval; int32_t length = env->length(env, stack, sv_nums); int32_t* nums = env->get_elems_int(env, stack, sv_nums); int32_t total = bind_clib_sum(nums, length); stack[0].ival = total; return 0; }
Notice the line reading the header.
#include "bind_clib.h"
This header is included from "lib/SPVM/BindCLib.native/include/bind_clib.h". This is pure C header file.
#include <inttypes.h> int32_t bind_clib_sum(int32_t* nums, int32_t length);
SPVM sets the include directory("SPVM/BindCLib.native/include") as the default header file read path.
C library source file is "lib/SPVM/BindCLib.native/src/bind_clib.c". This is pure C source file.
#include "bind_clib.h" int32_t bind_clib_sum(int32_t* nums, int32_t length) { int32_t total = 0; for (int32_t i = 0; i < length; i++) { total += nums[i]; } return total; }
SPVM compiles all source files in the source directory("SPVM/BindCLib.native/src"). It can contain multiple source files.
See SPVM:Document::NativeAPI about the details of the native APIs.
If you want to know more about the bindings of other C libraries, see the example below.
If you want to know more about the bindings of C++ libraries to SPVM, see the example below.
If you want to know more about the bindings of CUDA to SPVM, see the example below.
SPVM::Document::Tutorial::Complex
Copyright (c) 2023 Yuki Kimoto
MIT License
To install SPVM, copy and paste the appropriate command in to your terminal.
cpanm
CPAN shell
perl -MCPAN -e shell install SPVM
For more information on module installation, please visit the detailed CPAN module installation guide.