https://github.com/empathy87/hdk
Hack Development Kit
https://github.com/empathy87/hdk
Last synced: 7 days ago
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Hack Development Kit
- Host: GitHub
- URL: https://github.com/empathy87/hdk
- Owner: empathy87
- Created: 2023-04-02T07:12:37.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2024-11-10T15:10:26.000Z (over 1 year ago)
- Last Synced: 2025-06-02T13:52:46.653Z (about 1 year ago)
- Language: Assembly
- Size: 90.8 KB
- Stars: 2
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# From NAND to Tetris: Part 2
This project is an implementation of the second part of the
"From NAND to Tetris" course, which aims to teach computer
science from the ground up by building a complete,
working computer system from basic logic gates.
This project covers the software side of the computer
system, including assembler, virtual machine, the operating
system and the compiler.
import org.rocksdb.*;
public class BlobDBBenchmark {
static {
RocksDB.loadLibrary();
}
public static void main(String[] args) {
Options options = new Options();
options.setCreateIfMissing(true);
// Enable BlobDB features
options.setEnableBlobFiles(true);
options.setMinBlobSize(4096); // Example: Only store values > 4 KB in BlobDB
options.setBlobFileSize(1024 * 1024 * 128); // Example: Max blob file size 128 MB
options.setEnableBlobGarbageCollection(true);
options.setBlobGarbageCollectionAgeCutoff(0.25); // 25% of the blob file must be obsolete to trigger GC
try (RocksDB db = RocksDB.open(options, "path/to/db")) {
// Test data loading
long startTime = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
byte[] key = ("key" + i).getBytes();
byte[] value = new byte[8192]; // 8 KB value, stored in blob files
db.put(key, value);
}
long endTime = System.currentTimeMillis();
System.out.println("Data Insertion Time: " + (endTime - startTime) + " ms");
// Test data retrieval
startTime = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
byte[] key = ("key" + i).getBytes();
db.get(key);
}
endTime = System.currentTimeMillis();
System.out.println("Data Retrieval Time: " + (endTime - startTime) + " ms");
} catch (RocksDBException e) {
System.err.println("Error working with RocksDB: " + e.getMessage());
} finally {
options.close();
}
}
}
import org.rocksdb.*;
public class FRocksDBBenchmark {
static {
RocksDB.loadLibrary();
}
public static void main(String[] args) {
Options options = new Options();
options.setCreateIfMissing(true);
// Enable BlobDB features in FRocksDB, similar to RocksDB
options.setEnableBlobFiles(true);
options.setMinBlobSize(4096); // Set minimum blob size, e.g., 4 KB
options.setBlobFileSize(1024 * 1024 * 128); // Set blob file size, e.g., 128 MB
options.setEnableBlobGarbageCollection(true);
options.setBlobGarbageCollectionAgeCutoff(0.25); // 25% cutoff for GC
try (RocksDB db = RocksDB.open(options, "path/to/frocksdb_benchmark")) {
// Benchmark write performance
long startTime = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
byte[] key = ("key" + i).getBytes();
byte[] value = new byte[8192]; // 8 KB value, to be stored in blob files
db.put(key, value);
}
long endTime = System.currentTimeMillis();
System.out.println("Data Insertion Time: " + (endTime - startTime) + " ms");
// Benchmark read performance
startTime = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
byte[] key = ("key" + i).getBytes();
db.get(key);
}
endTime = System.currentTimeMillis();
System.out.println("Data Retrieval Time: " + (endTime - startTime) + " ms");
} catch (RocksDBException e) {
System.err.println("Error working with FRocksDB: " + e.getMessage());
} finally {
options.close();
}
}
}