For example:
root [] printTreeSummary(tree);
The TTree "T" takes 3764343 bytes on disk
Its branch "event" takes 3760313 bytes on disk
root [] printBranchSummary(tree->GetBranch("event"));
The branch "event" takes 3760313 bytes on disk
Its sub-branch "TObject" takes 581 bytes on disk
Its sub-branch "fType[20]" takes 640 bytes on disk
Its sub-branch "fEventName" takes 855 bytes on disk
Its sub-branch "fNtrack" takes 506 bytes on disk
Its sub-branch "fNseg" takes 554 bytes on disk
Its sub-branch "fNvertex" takes 507 bytes on disk
Its sub-branch "fFlag" takes 420 bytes on disk
Its sub-branch "fTemperature" takes 738 bytes on disk
Its sub-branch "fMeasures[10]" takes 1856 bytes on disk
Its sub-branch "fMatrix[4][4]" takes 4563 bytes on disk
Its sub-branch "fClosestDistance" takes 2881 bytes on disk
Its sub-branch "fEvtHdr" takes 847 bytes on disk
Its sub-branch "fTracks" takes 3673982 bytes on disk
Its sub-branch "fHighPt" takes 59640 bytes on disk
Its sub-branch "fMuons" takes 1656 bytes on disk
Its sub-branch "fLastTrack" takes 785 bytes on disk
Its sub-branch "fWebHistogram" takes 596 bytes on disk
Its sub-branch "fH" takes 10076 bytes on disk
Its sub-branch "fTriggerBits" takes 1699 bytes on disk
Its sub-branch "fIsValid" takes 366 bytes on disk
Author:
This notebook tutorial was automatically generated with ROOTBOOK-izer (Beta) from the macro found in the ROOT repository on Tuesday, January 17, 2017 at 02:43 PM.
In [1]:
%%cpp -d
#include "TTree.h"
#include "TBranch.h"
#include "Riostream.h"
#include "TMemFile.h"
#include "TKey.h"
#include "TBranchRef.h"
Long64_t GetTotalSize(TBranch * b, bool ondisk, bool inclusive);
Long64_t GetBasketSize(TBranch * b, bool ondisk, bool inclusive);
A helper function is created:
In [2]:
%%cpp -d
Long64_t GetBasketSize(TObjArray * branches, bool ondisk, bool inclusive) {
Long64_t result = 0;
size_t n = branches->GetEntries();
for( size_t i = 0; i < n; ++ i ) {
result += GetBasketSize( dynamic_cast<TBranch*>( branches->At( i ) ), ondisk, inclusive );
}
return result;
}
A helper function is created:
In [3]:
%%cpp -d
Long64_t GetBasketSize(TBranch * b, bool ondisk, bool inclusive) {
Long64_t result = 0;
if (b) {
if (ondisk && b->GetZipBytes() > 0) {
result = b->GetZipBytes();
} else {
result = b->GetTotBytes();
}
if (inclusive) {
result += GetBasketSize(b->GetListOfBranches(), ondisk, true);
}
return result;
}
return result;
}
A helper function is created:
In [4]:
%%cpp -d
Long64_t GetTotalSize( TBranch * br, bool ondisk, bool inclusive ) {
TMemFile f("buffer","CREATE");
if (br->GetTree()->GetCurrentFile()) {
f.SetCompressionSettings(br->GetTree()->GetCurrentFile()->GetCompressionSettings());
}
f.WriteObject(br,"thisbranch");
TKey* key = f.GetKey("thisbranch");
Long64_t size;
if (ondisk)
size = key->GetNbytes();
else
size = key->GetObjlen();
return GetBasketSize(br, ondisk, inclusive) + size;
}
A helper function is created:
In [5]:
%%cpp -d
Long64_t GetTotalSize( TObjArray * branches, bool ondisk ) {
Long64_t result = 0;
size_t n = branches->GetEntries();
for( size_t i = 0; i < n; ++ i ) {
result += GetTotalSize( dynamic_cast<TBranch*>( branches->At( i ) ), ondisk, true );
cerr << "After " << branches->At( i )->GetName() << " " << result << endl;
}
return result;
}
A helper function is created:
In [6]:
%%cpp -d
Long64_t GetTotalSize(TTree *t, bool ondisk) {
TKey *key = 0;
if (t->GetDirectory()) {
key = t->GetDirectory()->GetKey(t->GetName());
}
Long64_t ondiskSize = 0;
Long64_t totalSize = 0;
if (key) {
ondiskSize = key->GetNbytes();
totalSize = key->GetObjlen();
} else {
TMemFile f("buffer","CREATE");
if (t->GetCurrentFile()) {
f.SetCompressionSettings(t->GetCurrentFile()->GetCompressionSettings());
}
f.WriteTObject(t);
key = f.GetKey(t->GetName());
ondiskSize = key->GetNbytes();
totalSize = key->GetObjlen();
}
if (t->GetBranchRef() ) {
if (ondisk) {
ondiskSize += GetBasketSize(t->GetBranchRef(), true, true);
} else {
totalSize += GetBasketSize(t->GetBranchRef(), false, true);
}
}
if (ondisk) {
return ondiskSize + GetBasketSize(t->GetListOfBranches(), /* ondisk */ true, /* inclusive */ true);
} else {
return totalSize + GetBasketSize(t->GetListOfBranches(), /* ondisk */ false, /* inclusive */ true);
}
}
A helper function is created:
In [7]:
%%cpp -d
Long64_t sizeOnDisk(TTree *t) {
// Return the size on disk on this TTree.
return GetTotalSize(t, true);
}
A helper function is created:
In [8]:
%%cpp -d
Long64_t sizeOnDisk(TBranch *branch, bool inclusive)
{
// Return the size on disk on this branch.
// If 'inclusive' is true, include also the size
// of all its sub-branches.
return GetTotalSize(branch, true, inclusive);
}
A helper function is created:
In [9]:
%%cpp -d
void printBranchSummary(TBranch *br)
{
cout << "The branch \"" << br->GetName() << "\" takes " << sizeOnDisk(br,true) << " bytes on disk\n";
size_t n = br->GetListOfBranches()->GetEntries();
for( size_t i = 0; i < n; ++ i ) {
TBranch *subbr = dynamic_cast<TBranch*>(br->GetListOfBranches()->At(i));
cout << " Its sub-branch \"" << subbr->GetName() << "\" takes " << sizeOnDisk(subbr,true) << " bytes on disk\n";
}
}
A helper function is created:
In [10]:
%%cpp -d
void printTreeSummary(TTree *t)
{
cout << "The TTree \"" << t->GetName() << "\" takes " << sizeOnDisk(t) << " bytes on disk\n";
size_t n = t->GetListOfBranches()->GetEntries();
for( size_t i = 0; i < n; ++ i ) {
TBranch *br =dynamic_cast<TBranch*>(t->GetListOfBranches()->At(i));
cout << " Its branch \"" << br->GetName() << "\" takes " << sizeOnDisk(br,true) << " bytes on disk\n";
}
}