mohashari’s gists

mohashari / snippet-1.txt

Created July 26, 2026 01:03

Designing a Lock-Free Read-Copy-Update (RCU) Cache in C++ for Ultra-Low Latency Routing Tables — code snippets

mohashari / snippet-1.sh

Created July 26, 2026 01:02

Implementing Ephemeral WireGuard VPN Tunnels for Secure Cross-Cloud Database Replication — code snippets

	#!/usr/bin/env bash
	set -euo pipefail

	# Enable IP forwarding and disable reverse path filtering hazards
	echo "Optimizing network sysctl for WireGuard gateway..."
	sudo sysctl -w net.ipv4.ip_forward=1
	sudo sysctl -w net.ipv4.conf.all.forwarding=1
	sudo sysctl -w net.ipv4.conf.all.rp_filter=2
	sudo sysctl -w net.ipv4.conf.default.rp_filter=2

mohashari / snippet-1.txt

Created July 26, 2026 01:01

Debugging Socket Buffer Bloat and TCP Queueing Delay in High-Throughput Go Services with eBPF — code snippets

mohashari / snippet-1.py

Created July 26, 2026 01:00

Implementing Custom KV Cache Eviction Policies in vLLM for Multi-Tenant Chatbots — code snippets

	from fastapi import Request, HTTPException
	from typing import Dict, Any
	import jwt

	# Secret key used for decoding JWT headers passed by the API Gateway
	JWT_SECRET = "production_super_secret_key_rotation_99"

	class TenantContextMiddleware:
	async def __call__(self, request: Request, call_next):
	# Extract JWT from Authorization header

mohashari / snippet-1.txt

Created July 25, 2026 01:05

Designing a Zero-Allocation Circular Buffer Log Writer in C++ Using Atomic Memory Operations and Memory-Mapped Files — code snippets

	#include <atomic>
	#include <cstdint>

	struct alignas(64) LogSlot {
	std::atomic<uint32_t> status; // 0 = Empty, 1 = Writing, 2 = Ready
	uint32_t length;
	char payload[248]; // 256 bytes total slot size (perfectly fits 4 cache lines)
	};

	struct alignas(64) LogControlBlock {

mohashari / snippet-1.yaml

Created July 25, 2026 01:04

Implementing Zero-Trust Service-to-Service Authorization Using Envoy Proxies and Open Policy Agent (OPA) — code snippets

	# Envoy HTTP filter configuration for OPA external authorization
	http_filters:
	- name: envoy.filters.http.ext_authz
	typed_config:
	"@type": type.googleapis.com/envoy.extensions.filters.http.ext_authz.v3.ExtAuthz
	grpc_service:
	envoy_grpc:
	cluster_name: ext-authz-opa
	timeout: 0.15s
	transport_api_version: V3

mohashari / snippet-1.txt

Created July 25, 2026 01:03

Implementing Pipeline Parallelism for Distributed Transformer Inference on Local Hardware Using Socket-Based IPC in Rust — code snippets

	use std::convert::TryInto;
	use std::slice;

	#[repr(C, align(8))]
	#[derive(Debug, Copy, Clone)]
	pub struct FrameHeader {
	pub magic: [u8; 4], // Must be b"TNSR"
	pub msg_type: u8, // 1: Token IDs (prefill), 2: Activations, 3: Logits, 4: Error
	pub shape_rank: u8,
	pub padding: [u8; 2], // Structural padding to align to 8-byte boundary

mohashari / snippet-1.yaml

Created July 25, 2026 01:02

Debugging CPU Throttling and CFS Bandwidth Control Issues in High-Throughput Go Containers Running on Kubernetes — code snippets

	apiVersion: apps/v1
	kind: Deployment
	metadata:
	name: high-throughput-service
	namespace: production
	spec:
	replicas: 10
	template:
	metadata:
	labels:

mohashari / snippet-1.sh

Created July 24, 2026 01:03

Implementing Real-Time Tensor-Parallelism Communication Over RDMA (RoCEv2) for Distributed LLM Inference — code snippets

	#!/usr/bin/env bash
	# Production initialization script for configuring RoCEv2 lossless network interfaces (Mellanox ConnectX)
	set -euo pipefail

	INTERFACE="eth0"
	# RoCEv2 uses DSCP value 26 (CS3) or 46 (EF) commonly. We will map traffic class to DSCP 26.
	PRIORITY=3
	DSCP=26

	echo "=== Configuring sysctl parameters for high-performance RDMA ==="

mohashari / snippet-1.yaml

Created July 24, 2026 01:02

Preventing Privilege Escalation in Kubernetes via eBPF-Based Dynamic Seccomp Profile Generation and Enforcement — code snippets

	apiVersion: security-profiles-operator.x-k8s.io/v1alpha1
	kind: ProfileRecording
	metadata:
	name: payment-service-recorder
	namespace: core-payments
	spec:
	kind: SeccompProfile
	recorder: bpf
	podSelector:
	matchLabels:

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