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Alignment in golang


Alignment in golang

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Alignment in golang
Tag : go , By : alchemist
Date : November 28 2020, 04:01 AM

I wish did fix the issue. I am implementing a network packet in golang. It was already implemented in C++. The purpose is to make the golang implemented client communicate with C++ implemented server. , According to Adrian and Volker's comment,
Q1: No
func PutUVarint
func PutUint32(b []byte, v uint32) {
    _ = b[3] // early check
    b[0] = byte(v)
    b[1] = byte(v >> 8)
    b[2] = byte(v >> 16)
    b[3] = byte(v >> 24)
} // assume it's littleEndian

// to store packet length into buffer.
PutUint32(buffer, pkt.length)

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what is byte alignment (cache line alignment) for Core Animation? Why it matters?


Tag : ios , By : mckasty
Date : March 29 2020, 07:55 AM
may help you . When the CPU copies something from memory into the CPU cache it does so in chunks. Those chunks are cache lines and they are of a fixed size. When data is stored in the CPU cache, it's store as lines. Making your data fit into the cache line size for your target architecture can be important for performance because it affects data locality.
ARMv7 uses 32 byte cache lines (like PowerPC). The A9 processor uses 64 byte cache lines. Because of this, you will see the most benefit by rendering into a rectangle that is on a 64 byte boundary and has dimensions that are a multiple of 64 bytes.

Set JTable header horizontal alignment based on value renderer column alignment


Tag : java , By : Priyatna Harun
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Here is an example of a custom header renderer that simply makes the text of the selected column Bold:
class MyTableHeaderRenderer implements TableCellRenderer
{
    private TableCellRenderer tableCellRenderer;

    public MyTableHeaderRenderer(TableCellRenderer tableCellRenderer)
    {
        this.tableCellRenderer = tableCellRenderer;
    }

    public Component getTableCellRendererComponent(JTable table, Object value,
        boolean isSelected, boolean hasFocus, int row, int column)
    {
        Component c = tableCellRenderer.getTableCellRendererComponent(
            table, value, isSelected, hasFocus, row, column);

        if (column == table.getSelectedColumn())
            c.setFont(getFont().deriveFont(Font.BOLD));

        return c;
    }
}
JTableHeader header = table.getTableHeader();
DefaultTableCellRenderer defaultRenderer = (DefaultTableCellRenderer)header.getDefaultRenderer();
header.setDefaultRenderer( new MyTableHeaderRenderer(defaultRenderer) );
TableCellRenderer tcr = table.getCellRenderer(0, column);
Component renderer = table.prepareRenderer(tcr, 0, column);
defaultRenderer.setAlignment( renderer.getAlignment() ); // whatever the alignment method is.
tableColumn.getCellRenderer(); 
tableColumn.getHeaderRenderer();

Biopython: Local alignment between DNA sequences doesn't find optimal alignment


Tag : development , By : drbillll
Date : March 29 2020, 07:55 AM
This might help you This seems to be a bug in the current implementation of local alignments in Biopython's pairwise2 module. There is a recent pull request (#782) on Biopython's GitHub, which should solve your problem:
>>> from Bio import pairwise2  # This is the version from the pull request
>>> seq1 = 'GTGGTCCTAGGC'
>>> seq2 = 'GCCTAGGACCAC'
>>> for a in pairwise2.align.localms(seq1, seq2, 1, -2, -2, 0):
        print pairwise2.format_alignment(*a)


GTGGTCCTAGGC----
     ||||||
----GCCTAGGACCAC
  Score=6

Optimising datastructure/word alignment padding in golang


Tag : go , By : leorick
Date : March 29 2020, 07:55 AM
wish helps you Currently there's no compile-time optimisation; the values are padded to 8 bytes on x64.
You can manually arrange structs to optimally utilise space; typically by going from larger types to smaller; 8 consecutive byte fields for example, will only use 8 bytes, but a single byte would be padded to an 8 byte alignment, consider this: https://play.golang.org/p/0qsgpuAHHp
package main

import (
    "fmt"
    "unsafe"
)

type Compact struct {
    a, b                   uint64
    c, d, e, f, g, h, i, j byte
}

// Larger memory footprint than "Compact" - but less fields!
type Inefficient struct {
    a uint64
    b byte
    c uint64
    d byte
}

func main() {
    newCompact := new(Compact)
    fmt.Println(unsafe.Sizeof(*newCompact))
    newInefficient := new(Inefficient)
    fmt.Println(unsafe.Sizeof(*newInefficient))
}

Sequence alignment of multiple slices of ints in golang


Tag : arrays , By : user143038
Date : March 29 2020, 07:55 AM
hope this fix your issue It depends on what your "cost" function is, where your goal is to minimize your "cost".
A cost function could be something like this. The idea is that a "mismatch" is more costly than if there isn't anything to match, which we'll call "overruns" (say twice as costly). Take the number of cases where a[i] != b[i + offset] for a and b equal to s1,s2,s3,s4 and double it. Then add to that the absolute value of each offset for each pairing (in this case 6 pairings for 4 arrays) for the number of overruns at the beginning. Then add onto that the overruns at the end.
func cost(sn [][]int16, offsets [][]int) int {
  // cost accumulator
  c := 0.0

  // the factor of how much more costly a mismatch is than an overrun
  mismatchFactor := 2.0

  // define what you want, but here is an example of what I said above
  for i1:=0;i1<len(sn);i++ {
    for i2:=i1+1;i2<len(sn);i2++ {
      c += mismatchFactor * diff(sn[i1], sn[i2], offsets[i1][i2])
      c += math.Abs(offsets[i1][i2])
      c += math.Abs(len(sn[i1]) + offsets[i1][i2] - len(sn[i2]))
    }
  }
}

// offset of the offset of s1 wrt s2
func diff(s1 []int16, s2 []int16, offset int) int {
  // index, index, diff total
  i1,i2,d := 0,0,0
  if offset >= 0 {
    i1 += offset
  } else {
    i2 -= offset
  }
  while i1<len(s1) && i2<len(s2) {
    if s1[i1] != s2[i2] {
      d++
    }
    i1++
    i2++
  }
  return d
}
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